Time out error during loging at BSNL Brodband

I have BSNL brodband connection from feb 07. I have no problem to browsing to internet as well as email service of Dataone. But I am unable to administrative loging or Account user loging. During loging it shown Run time error. But from other dataone user my id & passowerd work properly. The BSNL person said that it was problem my PC. I am use XP as OS.
Please help me to servive my problem