Trouble running Team Fortress 2 (TF2) on win 7 boot camp 2.02

The title pretty much says it all.

I can't seem to get Team Fortress 2 (or any of the Source Engine games) running on my Windows 7 x64 Boot Camp partition under VMware Fusion.  It works just fine when loading Boot Camp itself, but trying it on Fusion gets me this weird error (attached--tells me to go to https://support.steampowered.com/kb_article.php?p_faqid=772).

Is there anything I can do or is it known that it will not work?

Thanks in advance

EDIT: Whoops probably should have included this on the first try!

MacBook Pro (early/mid 2008)

OSX 10.5.6

2.5 GHz Intel Core 2 Duo (both cores on virtual machine)

4 GB RAM (1 GB on virtual machine, tried toying with more)

GeForce 8600M GT/512 MB RAM

3D acceleration enabled