Seems installing Win 7 makes the Acer wireless drivers go away. First, make sure you are up to date with your updates
Go into: control panel > system > device manager (need admin authorization) > network adapters
You'll more than likely see a yellow icon next to some hardware shown there. Right click on that device and select, install drivers or update drivers
If no icon there, you can go to this pagehttp://support.acer.com/product/default.aspx?modelId=3680
use the "Download Hardware Vendor Detection Utility" (since there are four possible vendors for the wireless) and then download the appropriate driver from the list lower down on the page.
Hope it helps