Astounding 5000 lag

Hye guys so whenever i play the game i get between 1k-5k ping in multiplayer games. 

I play BF3 and starcraft daily and regularly and have never seen this before in my life. I usually never get higher than 50 ms to any server. It can't be my computer because i have an i7-950@4.0 Ghz and a gtx580 with 6 gigs of ram and it can't be my internet because as ive explained before i have never gotten lag before, and in am on wired university internet. 

Anyone got any ideas how i can fix this? I really want to play the multiplayer but am unable to with this degree of lag.

TIA.

~Raz