I'm running FC5t2 on an Dual Core Pentium w/ASUS MB and NVIDIA GeForce 6600 vid card. While working the screen will periodically lockup. The only 2 things I can do is CTRL-ALT-BKSP or ALT-F#. If I ALT-F# first, and then return to ALT-F7, I'm completely locked-up and have to press reset. Any Ideas? Todd