Windows Vista-Wireless Lan Lag Spikes Problem....( Please Help)

Hi, I just bought a new computer, and the interenet works fine for browsing/downloading, but for gaming I get lag spikes every 30-60 seconds or so.

Ive checked on the internet for the sollution, but I havnt been able to understand or find the correct drivers to fix this problem. Someone said to download Windows XP Drivers to replace my windows vista drivers. I have no clue where to find them or what drivers i need to fix these lag spikes.

Any help would be appreciated. Im using this:

HP Pavilion a6700f PC
AMD Phenom x4 9150e Quad-Core
Wireless Lan 802.11b/g
Windows Vista Home Premium 64-bit edition with service pack 1

When I go to Device Manager under Network Adapters I see this:

-Nvidia nForce 10/100 Mbps Ethernet
-USB Wireless 802.11 b/g Adapter

Ive had problems with running some games, but it was fixed by right clicking on the shortcut icon, and going to compatibility and checking "run Windows XP Service pack 2"

But I have no idea how to fix these annoying lag spikes... Or what my Wireless driver is. Someone said my wireless internet dosnt have xp drivers to dl or something.. Im running on Vista, but most problems have been fixed by running Windows XP service pack 2.

Please Help me, Id really appreciate it, Thank You!