Hidden from kindlekitten
Spoiler:
If you want to try one last time to get rid of the virus try this.
If you want to totally reformat and start new just tell me what version of windows your using (AND that you have those disks).
One of the key steps in trying to remove a virus is to turn off "System Restore" if you're using a newer version of windows. I've read (who knows if it's true) that some viruses will use System Restore to reload itself on the next boot up. Restarting the computer is supposed to wipe out the System Restore file after you have turned System Restore off.
See
restart windows in safe mode for instructions on how to restart your version in "Safe Mode". NOTE - you need a wired keyboard to do it.
In Safe Mode
with network connections you can download and run the antivirus of your choice. The reason I say to download and run an antivirus as opposed to running your own antivirus program is because, years ago a virus took command of my A/V program, McAfee.
"Luckily, I had done a backup on a portable disk on Sunday"
General note - the backup may have the virus on it.