Hi there, I am having the smae issue with playing online games, such as Vanguard too. I could be half way through a fight and the whole thing hangs for a moment or two. When it comes back I found that the rest of my group have killed the target and moved onto the next mob 20m away.
The one thing we have in commong id the D-Link DWL-G122. Now I am running Vista x64 and there are NO drivers on the D-Link site that match the my Revision C version 3.10 model. There are drivers for version 3.01 but only XP drivers for 3.10. So I did some hunting on the Internet and found some drivers. Now these seem to work but not that well. I still have the same issues.
I am now getting close to ordering a new USB WiFi dongle.