Disconnection with games with my adapter/modem.

Ok, I've had this never ending problem for the past month,(I'll get to the problem) so, I re-formatted my pc in a cry for help. Wierdly enough, the problem's still there... So, say I'm trying to connect to a DoD1.6(Sometimes but rarely CS1.6) server, when it reaches Precaching Resources, dod crashes and a popup comes up saying, Net_SENDPACKET error: NO ERROR, disconnecting me from the internet in the process. With Guild Wars, when I'm loading my character, loading a different place, or anything(Never in the middle of a game) I'll lose my Internet connection, the Above fatal error doesn't pop up.
If it helps, my connection is Qwest DSL, an ActionTec Wireless 54mbs Gateway Modem, and a Linksys Wireless-G 2.4GHz, 802.11g(<--Don't know what that number is, thought i'd add it) USB Network Adapter.

I hope this I enough information to get you started on helping resolve my problem.

~Jaymes

I've lost half my hair, pulling it out out of frustration every time i get this disconnection(a lot...)
BUMP

How strong is the wireless signal? My son is in the garage and has an OK signal. He can surf the net, download files, etc., but has problems with online games and streaming video as the signal bottoms out when he makes the attempt, causing lost packets and dropped connections. If you are close enough, you might want to try the same with a wired connection to see if it is just with wireless that this occurs.