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I installed Windows 7 Ultimate x64 today and got Quartus II V9.0 up and running OK, didn't even reinstall it, just used the installation I previously used in Vista x32. I tried to install the USB-Blaster using the drivers that came with Quartus II V9.0 but Windows 7 complains about them not being digitally signed and installing them either way will not work. Those drivers that came with the Programmer V9.x sp2 won't work either.
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It was mentioned here in this forum several times, "newer" USB-Blaster drivers don't work on "later" (including both Vista and Windows 7) 64-bit Windows systems. I didn't try Windows 7, but it would likely work as long as it is the 32-bit version.
The problem is that later drivers are not signed, and 64-bit Vista/Windows7 would not load an unsigned driver. You would need to use a driver from earlier Quartus versions, that included a driver signed by FTDI. I don't remember exactly which version, I think it was Quartus 7, but perform a search on the forum.
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