You can check if your BIOS has any information on the wireless card installed.
From start menu you can run msinfo32
press enter. Then go into Components
and see if there is anything in there.
But after looking at the site a little harder the only (WLAN) Drivers for Windows 7 was this one.
Broadcom Wireless LAN Driver Windows 7 (32/64) 188.8.131.52 Download
Unless you have a WiMax but I think you would know if you did.
You can also probably remove part of the back and access the Wlan adapter. I dont know exactly which area it is in though.
If the Broadcom doesnt work try this one.
Atheros Wireless LAN Adapter Windows 7 (32/64) 184.108.40.2069.0 Download