You have a virus that was contained in a certain codec install.
Proably changed your keys located at:
Code:
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\MountPoints2\
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\MountPoints2\C
and some more similar locations! Do you have a completly updated antivirus software? If yes then how did the virus enter your computer. It time to dumb your antivirus and buy a new one! But as for the solution. try system restore and then install a geniune antivirus that you buy and run a deep scan or complete scan on your machine in safe mode! All the best!
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