Shared folder not accessible in domain

Hi,

I have a Windows 2008 server based domain. Client systems are Windows 7 installed. There is a domain user who is not able to access one shared folder. He has been given all required permission and he was able to access it till date. Surprisingly I checked from another workstation with that same user login, shared folder is accessible. But it is not accessible from that particular system. I have tried the below:
> Unshared and shared it again.
> Added the perticular system to that folder share 7 security permission.
Still not working. Please suggest if anybody have any option.

Thanks in advance…
San3d