The message you are seeing is not from NSA or National Security Agency. National Security Agency Virus is yet another ransomware Trojan virus. It locks computer and asked for $300 to unlock with 72 hours. Nowadays is NSA in lot of news. It uses Internet Surveillance Program. It spies on Citizen and non-citizen. But it never locks Citizen’s Computer like this. Here is message from this virus on your locked screen:

NATIONAL SECURITY AGENCY
Defending our nation/Securing the future
Your Computer has been locked!
Your computer has been locked due to suspicions of illegal content downloading and distribution.
The downloaded content (photo and video files) was automatically classified as child pornographic materials.
Section xyx: Your case can be classified as occasional/unmotivated, according to 137 (U.S Code)
Thus it may be closed without prosecution. Your computer will be unblocked automatically. In order to resolve the situation in an above-mentioned way you should pay a fine of $300 using MoneyPak system.

This message is definitely from Virus not from US Government. So do not pay this imposed fine. It is a fake. You can call local Police and complain about it. However, you still need to remove this virus and unlock your computer. There are several ways to remove this lock from your PC. We described easiest way to remove this virus. Please try and see if this works on your case. Each computer case is different so this described method may not be applicable in your case if virus is not removed and your screen is not unlocked. In such scenario we highly encouraged to get in touch with our virus removal tech team and see how we can help you remove this threat from your computer.
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Your browser has been blocked Virus is a ransomware. This newer version of virus uses javascript to lock your browser. Previously they used to call computer. Here is message from this virus on your locked screen:

The FBI Federal Bureau of Investigation
Cyber Department
All activities of this computer have been recorded
All your files are encrypted. Do not try to unlock your computer!
Your browser has been blocked due to at least one of the reasons specified below.
You have been subjected to violation of Copyright and Related Rights Law (Video, Music, and Software) and illegally using or distributing copyrighted contents, thus infringing Article 1, Section 8, Clause 8, also known as the Copyright of the Criminal Code of United States of America.
Article 1, Section 8, Cause 8 of the Criminal Code provides for a fine of two to five hundred minimal wages or a deprivation of liberty for two to eight years.
You have been viewing or distributing prohibited Pornographic content (Child Porno photos and etc were found on your computer). Thus violating article 202 of the Criminal Code of United States of America provides for a deprivation of liberty for four to twelve years.
Illegal access has been initiated from your PC without your knowledge or consent, your PC may be infected by malware, thus you are violating the law on Neglectful Use of Personal Computer. Article 210 of the Criminal Code provides for a fine of up to $100,000 and/or deprivation of liberty for four to nine years.
Pursuant to the amendment to Criminal Code of United States of America of May 28, 2011, this law infringement (if it is not repeated – first time) may be considered as conditional in case you pay the fine of the States.
To unlock your computer and avoid other legal consequences, you are obligated to pay a release fee of $300, payable through GreenDot MoneyPak (you have to purchase MoneyPak card, load it with $300 and enter the code). You can buy the code at any shop or gas station. MoneyPak is available at the stores nationwide.
Your browser will be unblocked within 3-12 hours after the money is put into the State’s account.
Please note: Fine must be paid within 12 hours. As soon as 12 hours elapse, the possibility to pay the fine expires. All PC data will be detained and criminal procedures will be initiated against you if the fine is not paid.

Message might look real but do not worry. And don’t even think about paying $300 to unblock your browser. Paying this ransom will not solve your problem. It will give you temporary access then it will lock browser back again. Here is guide remove this virus and unblock your computer. Per our observation following process is infected iexplore.exe, chrome.exe, Safari.exe, seamonkey.exe, opera.exe, firefox.exe. Try to follow this unblock/unlock guide carefully.
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The popup stating “Please Install Codec Performer Update” is a adware or unwanted program. It uses some fancy mechanism to trick users. Here the message from the one of the infected computer:

Codec Performer Update is Recommended
Please Install Codec Performer Update (RECOMMENDED)
Supports MP3, WMA, RealVideo, RealAudio, DivX, XviD and much more
Based on FFDShow and Haali splitter the leading codecs libraries
One install for all your codecs need
100% Free & Safe- share it with your friends
Updating takes under a minute and you do not need to restart after installation

It affected mostly your browsers. You may find this pop-up whenever you try to perform search on Google. In other words you computer is infected with this virus. On surface you may not find any money grabbing scam. But its purpose it to generate sales for its affiliated site or generate leads in some cases.
Typically PUP like Install Codec Performer Update virus installs Delta Toolbar, Babylon Toolbar, Yontoo, DealPly, CouponBuddy and many other adwares and tools. It literally slow down your PC and causes you to cry for help. Your privacy is also compromised. We highly recommend you to remove Please Install Codec Performer Update virus using this guide.
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Cyber Command of Illinois virus is a threat that is also considered as ransomware. It is computer virus that infects users from Illinois. It accuses user for violating law of the State. Here is message from this virus on your locked screen:

U.S.A. Cyber Crime Investigations
Cyber Command of Illinois
Attention! Your computer has been blocked up for safety reasons listed below.
You are accused of viewing/storage and/or dissemination of banned pornography (child pornography/zoophile/rape etc). You have violated World Declaration on non-proliferation of child pornography. You are accused of committing the crime envisaged by Article 161 of United States of America criminal law.
Article 161 of United States Of America criminal law provides for the punishment of deprivation of liberty for terms from 5 to 11 years.
Also, you are suspected of violation of “Copyright and Related rights Law” (downloading of pirated music, video, ware) and of use and/or dissemination of copyrighted content. Thus, you are suspected of violation of Article 148 of United States of America Criminal Law.
Article 148 of United States of America criminal law provides for the punishment of deprivation of liberty for terms from 3 to 7 years or 150 to 550 basic amounts fine.
It was from your computer, that unauthorized access had been stolen to information of State importance and to data closed for public Internet access.

Message may be varying from state to state, but underlying mechanism is same. It locks computer without user’s knowledge or permission then locks computer. It tells users they did not follow the rules and regulation of the country and Government has blocked this computer’s access. To get back to normal mode user must pay fine of $300 (which is not really fine, but ransom.) You should not pay this ransom at any cost. You could lose computer data if you don’t remove this virus. We have prepared this guide specifically designed to remove Cyber Command of Illinois Virus. Please follow this guide carefully to remove this virus safely.
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Message on your screen from Cyber Command of Pennsylvania is a screen locker virus. It acts like department of State or Federal department. Do not panic if you see any or similar verbiage of this message:

Cyber Command of Pennsylvania
FBI
U.S.A. Cyber Crime Investigations
Cyber Crime Unit
Cyber Police
Interpol
Attention!
Your computer has been blocked up for safety reasons listed below.
You are accused of viewing/storage and/or dissemination of banned pornography (child pornography/zoophile/rape etc). You have violated World Declaration on non-proliferation of child pornography. You are accused of committing the crime envisaged by Article 161 of United States of America criminal law.
Article 161 of United States of America criminal law provides for the punishment of deprivation of liberty for terms from 5 to 11 years.
Also, you are suspected of violation of Copyright and Related rights Law (downloading of pirated music, video, wares) and of use and/or dissemination of copyrighted content. Thus, you are suspected of violation of Article 148 of United States of America Criminal Law.
Article 148 of United States of America criminal law provides for the punishment of deprivation of liberty for terms from 3 to 7 years or 150 to 550 basic amounts fine.
It was from your computer, that unauthorized access had been stolen to information of State importance and to data closed for public Internet access.
The penalty set must be paid in course of 48 hours as of the breach. On expiration of the term, 48 hours that follow will be used for automatic collection of data on yourself and your misconduct, and criminal case will be opened against you.
Amount of fine is $300. You can settle the fine with MoneyPak or MoneyGram express Packet vouchers.
As soon as the money arrives to the Treasury account, your computer will be unblocked in course of 24 hours.
Then in 7 day term you should remedy the breaches associated with your computer. Otherwise your computer will be blocked up again and criminal case will be opened against yourself (with no option to pay fine).

It is bogus and fabricated message on your computer. This virus has hijacked your computer and has taken your person picture without your permission or knowledge. So don’t worry if you see your picture on the message. When you have downloaded music or free tool from internet, accidently you have also downloaded this virus. Our guide will help you remove this virus and fix your computer. Do not plan to pay $100 to this ransomware as it will not unlock your computer. In contrary, you will lose money.
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