low ping bad reg,anything have to do with rig setting ?

hi guys.. i am experience really bad REG after i reinstall my OS.
my RIG:
Windows 7 ultimate 64 bit.
I7 950 quad core
GTX 460 1gb
6gb 1600 rams
Asus sabertooth x58 mobo.
FPS at 200 with 16 players ,any map,
all drivers updated. n my ping it;s around 50 . .
but my 50% of my shot didn't REG after new OS install.
so i am wondering is there anything to do with windows setting, or internet setting?
or maybe windows XP can do better with Crossfire Gaming? or maybe anything have to do with the game running contends ? i heared someone told me that CF is running better with 2 core instead.

anyone know anything, please comment ur exprience.

thx

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