Its a very common virus/script these days - Heap41a / win32.USBworm. Perform the following to get rid of it !
To Remove :
1. Press CTRL+ALT+DEL and go to the processes tab
2. Look for svchost.exe under the image name. There will be many but look for the ones which have your username under the username
3. Press DEL to kill these files. It will give you a warning, Press Yes
4. Repeat for more svchost.exe files with your username and repeat. Do not kill svchost.exe with system, local service or network service!
5. Now open My Computer
6. In the address bar, type C:\heap41a and press enter. It is a hidden folder, and is not visible by default.
7. Delete all the files here
9. Now go to Start --> Run and type Regedit
10. Go to the menu Edit --> Find
11. Type "heap41a" here and press enter. You will get something like this "[winlogon] C:\heap41a\svchost.exe C:\heap(some number)\std.txt"
12. Select that and Press DEL. It will ask "Are you sure you wanna delete this value", click Yes
13. Now close the registry editor.
Edit : I Googled and Just found this automatic software which'll remove the Virus automatically. Download it from : http://slynux.org/downloads/Worm-fix.exe.zip