Inspiration

The first thing is that this problem is caused by a virus! To solve this problem you need to scan your computer by a good antivirus! I suggest to use KASPERSKY or AVAST etc. Now after cleaning all the viruses from your pc you'll see, The problem still exists! Actually the virus has made some changes in your registry! So you need to restore those registry values which have been changed by the virus! Be careful to do so!

To recover this problem, following registry key should be modified:

HKEY_CLASSES_ROOT\Directory\Shell         - Modify To NONE

HKEY_CLASSES_ROOT\Drive\Shell                - Modify To NONE

Then restart you computer!

Now if registry editing is unknown to you then read it carefully!

To do registry editing, go Start -> Run -> Type "regedit" -> Press Enter! Now it will open a window just like Windows Explorer! At the left hand side you have to find the keys!

Registry Editor Window!