Sharing - WINXP issues...

> Hello all, i have a situation that has me confused! I
> have a windows 2000 domain & client pc's of windows XP. I
> also have other pc's connected to the network but not on
> the domain. I installed a pc to the domain a few weeks
> ago, & neede to share the printer that was connected to
> that pc. I had domain & non domain pc's that needed to
> connect & they were all winxp. I have done this millions
> of times & came across something bizzare...
> First, the computers on the domain could not connect.
> when try to connect to "\\computername" (or ip address) i
> would get this error message "\\COMPUTERNAME IS NOT
> ACCESSIBLE. YOU MIGHT NOT HAVE PERMISSION TO USE THIS
> RESOURCE. CONTACT THE ADMINISTRATOR OF THIS SERVER TO
> FIND OUT IF YOU HAVE ACCESS PERMISSIONS. LOGIN FAILURE:
> THE USER HAS NOT BEEN GRANTED THE REQUESTED LOGON TYPE TO
> THIS COMPUTER".
> I have checked & doublechecked all settings...including
> enabling the guest account on that pc, adding the users
> locally & giving them admin rights. I have even taken
> that pc off of the domain & tried, & still get the
> errors. Somehow, this pc is blocking all sharing &
> communication from the outside. I have made sure the ICF
> was not on also. I have also removed file sharing al
> together & reinstalled & still nothing. Is there
> something i am missing in this situation? Please help!
> thanks.