So I've got Win 7/Parallels 7 and I've played Oblivion, Bastion, Civ IV, DCUO, and a slew of other games on my VM without any issues. I fired up Fallout, and bam my VM goes to crap. I've rebooted both the VM and my MacBook Pro with no luck of fixing this issue. I've searched the forums and the wonderful WWW with no avail. Any help is appreciated thanks.
Support had me uninstall Parallel Tools... but now Fallout, Fallout 2, Fallout Tactics, and Mass Effect 2 won't launch. Or, if they do launch, their graphics are jacked up and get stuck at a black screen. ME2 won't launch at all. I get a "direct3d is not available because the computer is locked. keep trying?" error... Parallels 7... I'm starting to have my doubts..
Looks just like a normal Windows system with graphics set to 16 colors or so. Did you try looking at the display settings in Windows' control panel?