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 
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