your computer has been infected!

[Fed]

Did you try the automatic removal software at the site GX1_Man gave you?
The problem with these things is that new variants keep popping up & it takes the antivirus/malware people a little time to catch up.
Updating & running Ewido may fix it now when it didn't fix it a couple of days ago.

[Backdated]

This is a SmitFraud infection. You need to run SmitRem.
Save it on your desktop or somewhere that you can find it. Run the archive and it will create a folder called SmitRem. Do nothing yet!
Reboot to safe mode, navigate to the SmitRem folder and double click RunThis.bat.
A series of informational screens wll follow. Read each and press a key to continue.
Now the cleanup operation will begin. Any uninstallers for rogue programs will be initiated so follow the uninstall procedure.
After any rogue programs are uninstalled, the disk cleanup wizard will begin. Allow this to run it's full course.

Once done you should be able to reboot normally and free of any Smitfraud infection. A log file will be saved to c:\smitfiles.txt.

You should still check for other infections though. These things seldom seem to be unaccompanied.