Why Is Windowes Doing This To Me? Help

[alexia 0]

The setup is like this:Windows XP pro workstation, gets IP settings via DHCP.The copmany I work for has the internal domain setup as something like http://forums.xisto.com/no_longer_exists/ - it is setup 'properly' on the internal dns server.EVERY workstation has no problems accessing the internal domain, only my computer changes it to http://forums.xisto.com/no_longer_exists/
It makes no difference whether i use DHCP or manually configure the IP settings.Any idea why this is happening and why it only happens on my workstation?Thanks a lot in advance