Switch to Windows 7 instead of Windows XP, it won't use all that much more resources (the memory management in 7 is good) and will likely rid you of any strange compatibility glitches like you're experiencing, since the Parallels 6 3D rendering is always tweaked for the latest and greatest windows and old driver emulation paths get deprecated.
Runs decently on a 2009 MacBook Pro (2.26GHz) with 4 gigs of RAM, allocating 1.5GB of RAM to the Windows 7 environment. I have windowed mode set to 1152x720 (due to the dock being in the way), which is what I play in when I'm in Coherence mode, otherwise I just full screen it at 1280x800.
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