Post back with the details of the wireless adapter and we could be more help. As KewlX says, it matters not to eh OS which level of security is in use but some older adapters and dongles can't see WPA2. Generally, if you've to see if W7 will go into your laptop, chances are its adapter will be new enough to see it. If you have a PC, the card is easily replaced anyway.
Hello, Does Windows 7 support WPA2?