network problems between xp and 2000

I use a Dell D800 laptop at work which is on a domain. When I hook up the notebook to my local area network at home I can not access the XP computer that is one of the computers on my workgroup network at home. The laptop can hook up to the other Windows 2000 professional computers on the workgroup network and all of these computers can also hook up to the Windows XP system. I use a Linksys wireless router to access my home workgroup network. All other aspects of the network function properly I can even VPN into my domain network at work. Any assistance in resolving this problem would be greatly appreciated.