Once i got a vista system,64 bit with same issue ,nothing worked
Browsed through the web i found a wonderful solution
Open registry editor
Right click on WOW64 and select 'Modify'
Change Value Data from 1 to 0
Click on start-RUN
Type in: services.msc
Scroll down to Windows Installer and STOP the service and then START it again.
Then Reboot your machine.
Edited by narenxp, 10 December 2011 - 09:06 PM.