Can't open drive C: or D: or E: or F: by double clicking?

 Method one:
Open RUN by pressing windows key + R
then type "regedit" (without quotes) to open the windows registry
Press ctrl+F for the search window in the registry then type "mountpoints2" (without quotes) then hit enter... then delete it!
That's it. You're done!

Method 2:
press windows key+R then type "regsvr32 /i shell32.dll" (without quotes) then hit enter.
you'll recieve a successful message.

By World's Hackers