|One thing is to put a folder (folder) on each usb or removable drive you have called autorun.inf|
What you have installed was usually ran from a file (file) named autorun.inf. Usually hidden and if you unhide it and read it the cause of the issue will be found. It is usually difficult to fix this after it happens. Might try a bootable antivirus tool or manually find parts from the autorun.inf file either in registry or in startup or both.
Usually it calls some phoney sort of right sounding file. Delete that file in safe mode or with a live cd.
Worse comes to worse reload the OS. Be sure to never run as an admin user. Always use a limited user account even when you need admin. Use runas command to do all tasks.
Google is evil