Helpful to verify reports of your own downtime, or to double check a downed website you are trying to access.
One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.
Did u run adaware to other spwyare removal tools to remove spwyare\adwares from ur system when this started ??
if YES then this can be the reason, check this.....
Unable to Log On To Windows XP After Removing wsaupdater.exe
http://www.lavasofthelp.com/articles/v6/04/06/0901.html
Unable to logon to Windows after removing BlazeFind using a spyware removal utility?
http://www.winxptutor.com/wsaremove.htm