Dell Inspiron 620 wireless Adapter

Hello

I have a Dell Inspiron 620 Desktop computer that I want to go wireless. But every time I tried to install the following Dell wireless network adapters it says DW1525 adapter device not found. The adapters are:1.  ATHEROS WIRELESS 1525 WLAN MINI VERSION A02 and 2. ATHEROS WIRELESS 1525 WLAN MINI CARD V1.3.1.12. I really need a wireless adapter for my Desktop. I will highly appreciate any assistance from anybody. my email is <ADMIN NOTE: Email id removed per privacy policy> .

thanks

Diplomat56