Ransomware is computer malware which holds a computer system, or the data it contains, hostage against its user by demanding a ransom for its restoration.
Examples of extortive ransomware reappeared in May 2005. By mid-2006, worms such as Gpcode, TROJ.RANSOM.A, Archiveus, Krotten, Cryzip, and MayArchive began utilizing more sophisticated RSA encryption schemes, with ever-increasing key-sizes.
Gpcode.AG, which was detected in June 2006, encrypted with a 660-bit RSA public key. Gpcode.AK, detected in June 2008, uses a 1024-bit RSA key, which is believed to be large enough to be computationally infeasible to break without a concerted distributed effort.
Examples of extortive ransomware reappeared in May 2005. By mid-2006, worms such as Gpcode, TROJ.RANSOM.A, Archiveus, Krotten, Cryzip, and MayArchive began utilizing more sophisticated RSA encryption schemes, with ever-increasing key-sizes.
Gpcode.AG, which was detected in June 2006, encrypted with a 660-bit RSA public key. Gpcode.AK, detected in June 2008, uses a 1024-bit RSA key, which is believed to be large enough to be computationally infeasible to break without a concerted distributed effort.
simple method for those who aren't comfortable in command lines etc.
How to remove ransomware virus in windows xp
the tool you need is a boot cd called hirens bootcd
For Hiren boot cd in win7 users the ransomware file is located C:\Users\your account\AppData\Roaming
Boot pc into safemode with networking by pressing f8 key
Second download Malwarebytes run updates and a full scan then quarantine the virus
lastly download superantispyware and do the same thing.