Ping Spikes Since Installing Windows 7?

Ever since I installed Windows 7 on my PC a few months ago I've been getting consistent ping spikes on basically every game I play, but mostly on this one I'm playing most of the time. My ping will be a solid 20-22 for few minutes (often less and more often) when all of a sudden my ping spikes in the hundreds (150-400). Along with this, sometimes my UDP goes red. This never happened with XP, I'll even have the same game server on beside me with XP and I'll never see ping spikes. I've talked to other people who play the game and they experience the same thing, many of them for this very reason have decided to stick with XP for these particular game(s).Another thing that I've noticed since installing 7 is a delay (no better way to describe it, can't say it's lag since it says my ping is 20?). While on my XP PC 20 ping will feel just like that, 20 ping. On the 7, it feels like 50-70 (while saying 20). The game I play is very dependent on fast reaction times so this is obviously very annoying to me.