installing ie9 from windows update there is a virus attached

I downloaded and installed IE9 from windows update . After that I couldn't open hard drives C: and D: by double clicking but I could by right click and Open . Seaching the problem in Googgle the most topics refer that there is a virus which creates an autorun.inf file etc. They suggest the following , c:\attrib -s - h -r autorun.inf and Del autorun.inf and some changes in Registry . I applied everything related to these topics but the problem insisted . Finally I used the restore point created by IE9 and returned successfuly to IE8 and the problem disappeared . I tried to install four times IE9 in a period of 15 days but the result was absolutely the same .
The fake message when double clicked is : to open the drive ( or folder ) you need a program associated with it or something like that .
The safe conclusion is that the virus is installed in Registry since applying the restore point the problem is solved.

I think thats just the file associations messed up. Theres a tut that tells you how to restore default file associations.