In reply to elsewhere:
> First infection after using PCs for 20 years - no idea what's happening (written from Ubuntu machine).
Can you put the hard drive from the Windows machine into your ubuntu machine?
You can get virus scanners in linux - F-Prot, and clamAV - which will scan, and identify problems, then you can rename the infected files on the windows hard drive, and then when you boot back into Windows, they shouldn't be running.
The thing with Windows - and I'll probably get sick of saying this - is that you need to have two accounts on your computer, one with Administrative privileges, that is almost never used, and one just as a normal user. And you use the normal user account for internet and email, then if that account gets broken, you can log in with the other account.
If your computer is already f*cked, it can be difficult to create a new account because some malware stops certain things from running.
If you can, with Windows 7 (or Vista) there is a way to enable the "hidden" Administrator account, which requires you to run a command prompt in the "Run as Administrator" mode.
In the command prompt you use the following commands.
(Win 7 requires this first)
net user administrator password
(where password is something more than 8 letters, has upper and lower case and a character eg Password$)
net user administrator /active:yes
which makes it active
Then on a reboot, you should get an option at the login screen to login as Administrator
If the computer just goes straight into your account without logging in, then you need to log out to get the logon screen.