Welcome!
First, while there are a few Microsoft employees that post on these forums, most of us are not related to MS at all. I fall into the latter category.
Now, I use this wireless card in my desktop:
Newegg.com - Rosewill RNX-G300LX IEEE 802.11b/g PCI Wireless Card Up to 54Mbps Data Rates 64/128-Bit WEP, 802.1x, WPA, WPA2, AES, TKIP with 2 dBi Antenna - Wireless Adapters
That is a very cheap card. If you want something a bit better, look on Newegg.com, for
wireless g card. If you have an
n router, you may want to consider searching for
wireless n card.
I find the customer reviews to be very helpful. A reliable card looks like this:
A not-so-reliable card:
Good luck!
~JK