Please download a copy of Bitcomet 0.70, it should be working like it should, if it still behave the same, maybe your ISP (network provider) already limiting your bandwidth or something ... (very little chance... but it happens :P) www.bitcomet.com
if you are indeed infected by winsock virus, please download a copy of winsock fix in case you need it. http://www.snapfiles.com/get/winsockxpfix.html
and run it if needed.... (like after bitcomet 0.70 and still not working)
and see if all help
good luck