network password problem

my client has 2 windows xp workstations that connect to a win2003 server over a vpn. I'm not sure what tampering a former consultant has done to these machines. When they tried to connect to the server I would get a username/password dialog box even though it was a public share. No matter what name/pass I put in there it wouldn't accept it. On one of the workstations I used system restore to put the computer back a few months and then this problem simply went away, I was able to browse to the server with no problem. However, while doing a system restore with the other one it crashed and I was forced to a do repair. The problem still exists. Whenever I browse to the server it asks for a login but doesn't accept it. Anyone know what could be causing this? This same problem is also on my client's laptop so it has to be a configuration issue somewhere. The fact that the problem got fixed when I used system restore is proof of that.
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Any messages in the event viewer security log ?
Are there any shortcuts in network neigbourhood? removing them may help.

Also when the logon box comes up is there a remember password tick box? if so untick it and retry.

I have had similar problems with cached credentials. In the last case I fixed the user couldnt connect to any domain printers.

It may also be possible that the system is not connecting correctly throught the vpn, so is seen by your server as an external unauthenticated user.

Check the security and share settings on the folder you are trying to access.

Make sure the user attempting to access it is either in the list of people allowed access, or a member of one of the groups allowed acces to it.

Also, when you get the prompt box, try the servers administrator username and password.  If it has access, then you know it's a permissions problem.

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