Check all your drivers here:
http://support.acer.c...spx?tab=1&modelId=122
Selecting an operating system version doesn't seem to have any effect.
What's more the different versions don't seem to be sorted into any particular order, so you don't know which is which until you click download.
Once you click download, you'll see the name of the file. There don't seem to be any Win7 specific drivers, but the Vista ones should work OK.
If you have installed 32bit Win7, you need the Vista x86 drivers, otherwise, the Vista64 drivers.