Odd connection dropout

Hello,

I just recently put a new computer on my wireless network, and the instillation and initial connection went smooth. But when I play online games, specifically BF 2142, every minute or two my connection ping shoots way up, and I even get the connection has been interrupted, message, but almost immediately the connection speeds up again. So I get these huge spikes or connection dropouts, and I have no idea why. My girlfriends laptop uses a intel internal wireless card and she never has any issues playing.

I have the latest drivers and normal downloading and internet browsing runs fine.

Router: D-Link Model No: WBR-2310
Wireless adapter: RT2500 USB Wireless LAN Card

I am stumped and any suggestions would be wonderful, thank you!