User Proxy logon rejected on a specific PC only for a single user only.

We currently have several domains which are been consoladated into a single 2003 domain. We access the internet though a proxy server, those users who are already on the 2003 domain connect straight in, those who are on the other domains login via a login screen (user, password, domain); they have accounts which have already been created for them on the 2003 domain, which have a proxy group membership.

We have a user who's proxy logon on one specific PC is rejected, he can logon to other PC's and others can logon to his without any problems, it is only when he tries to connect to that one PC (which is the one he has been using to connect with in the past).

We have deleted and recreated his proxy user account (which is used to logon to the proxy server) and have also deleted is local profile on the PC. However, his proxy logon is still rejected.

The user is on a PC running windows 2000.

Can anyone advise me please?
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Maybe look to see if his user got added to that local machine. If it was his permissions could be to low to allow him to do anything even logon. Also look at the permissions on the c:\ and make sure he is not in denied access anywhere.  

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Windows 2000

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