I'm running win7, auto updates, latest nvidia drivers, on an amd dual core 32 bit 2.7 processor with 4gb memory. The machine works perfectly in all respects - except that it won't install any games! I've tried cod4, cod2, bioshock, crysis warhead, mass effect2...etc. All legitimate copies, bought from shops new. The same problem every time: installshield starts, then vanishes, leaving just the icon in the system tray. Hovering a mouse over that shows a blank, un-openable window. Task Manager says setup is running - but it never gets anywhere. Scannow shows no system file problems; dxdiag shows no dx problems; the dvd drive works perfectly for everything else. I'm completely baffled. Can anybody help? Please?!