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PC on the LAN inaccessible

I am unable to access a PC on the LAN. I have 3 PCs (say A, B and C), and three are in the same work group. The Internet is working well. Computer A can access B and C, but B and C cannot access A. The error message is the following: A is not accessible. You might not have permission to use this network resource. Contact the administrator of this service to find out if you have access permission. Access is denied.
This could be caused by a number of problems. First, ensure that you do not have any firewall running on A that is preventing it from being accessed. Second, ensure that you have configured computer A with the appropriate share permission to allow other devices to connect. With Windows XP you can cache login credentials, and it might be that you have cached an incorrect username and password to allow access to computer A. I would recommend clearing the cached passwords (assuming Windows XP, go into the control panel and access the User Accounts control panel applet. Then select the Advanced tab and click "Manage Passwords" to remove the cached credentials).

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