Weird ping?

Ok so i reformatted my computer installed crossfire, it was all good, everything normal. Then i reinstalled it because i was trying to fix my fps, and my ping is very weird, it used to be stable at 60-70, now it goes from 70-2000, its all over the place, its usually when there is 3 or 4 players around me. Its really unplayable, help please, im running windows 7 and i did the priority thing..

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