If you have another computer - look up System Tools - it will take you to various locations to give you instructions on how to remove.
I downloaded the Malware software from this site - the bit where it says "official mirror" is the bit you click on.
http://majorgeeks.com/download.php?det=5756The instructions to remove
http://forums.malwarebytes.org/index.php?showtopic=66064In a nutshell, you need to download the software on to a memory stick if you have it on another computer (don't install just yet).
Shut down infected computer and restart in safe mode (continuously pressing F8 when you start up). It will allow you to use your computer without the virus blocking you, then load the Malware software, if it prompts to download a newer version accept (I didn't and it didn't work the first time).
Hopefully you'll be able to get rid of this nasty without losing anything on the computer.