Cause only bitcomet cant connect to trackers i tried the same torrent with utorrent and it worked just fine ... Im not running any own trackers. I had encountered this problem before ... it's caused by the difference of tcpip.sys when i reinstalled the os and can be fixed by changing the tcpip.sys back to the original but now the new OS that i installed is win7 and it doesnt support any changes of tcpip.sys so i dont know how to fix it anymore =.=!
P/s : sorry for my bad english