Don't have a clue about Win 7...but what ver of DX are you running? Make sure you load DX from the disk. The game has a fit with DX 10 on many systems if that's what DX is with 7.
You can have multi installs of DX without a problem and each should read or load what is needed. I read a long thread about this somewhere. I was having some of the problems you had when I updated to 10.
You probably are, but make sure you're running as administrator . Wish I could help more..the brain power is in the hardware thread...try there.
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