Open command prompt. Go to Windows, then Run, and type "cmd" . Press enter.
Type "cd\" and press enter to get to the root directory of c:\ .
Type "attrib -h -r -s autorun.inf" and press enter.
Type "del autorun.inf" and press enter.
Repeat the same process with other drives, type "d:" and do the same thing. then next "e:".and restart your computer.
Restart your computer and it's done. Enjoy the freedom to open hard drives on a double click.