To make sure we are on the same page, is this your computer? -
Aspire® M3400
I am currently using
Linksys WMP54G IEEE 802.11b/g which works well with Windows 7 64-Bit. However the drivers needed to work with 64-Bit are not available from Linksys.
The point I'm trying making is that my card is an older wireless card and works just fine. I don't see having any troubles if you select a newer generation card (IEEE 802.11n). If you have any questions as to the card supporting Windows 7. You can always go to the manufacturer of the card in question and see what drivers available.