so i had just finished installing a fresh new copy of Windows 7 RC on my mac via boot camp and i was testing my kids games to make sure they still worked using Parallels when i decided to click on my left 4 dead icon and the game started up. i had tried it before using Vista but it would always crash. the movie played a little choppy at first but then fine default setting were low it was running @ 640x480 which left the window way to small to even play i tried upping the resolution but then the game crashed so i upped the ram to the virtual machine from 1.5 gigs to 2.5 and upped the video ram from 128 to 256. i could run the 1280x960 with everything set to low and its pretty playable even though it seems to be running in the low teens frames wise most of the time. i even played online. the only problem ive had is with the lighting. its a pretty dark game but looks even darker running on parallels and sometimes the flashlight seems like its not even on even though it is. ive played it for about 2 hours now. it works better if you use parallels in full screen mode, windowed does something to the controls and you cant move. im thinking about installing a virtual machine copy of windows 7 to see how it runs vs boot camp. if it runs better i might just stop playing on boot camp since i cant seem to get the sound driver working right anyway.