Scan with any good anti virus and if you get some infection like 'WVCST.VBS' delete them.If you get nothing do following:
Click Start, Run and type:
reg add hkcr\drive\shell /ve /d none /f
Press {ENTER}
Alternately, to do this manually via registry:
HKEY_CLASSES_ROOT\Drive\shell
Set (default) to "none" (without ")
hope this may solve your problem :D