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05 Nov 2009  

Windows 7 Ultimate 64Bit

And you have already tried manually install the driver?

"Is it possible to change the OS of the Windows 7 vmachine? I could try installing a differen XP32 (SP2 for example). "

You can boot to an XP SP2 image if you have one, i don't know if it'll change the results though. Create a new VM and boot to it.
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