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XP SP3 is used. The Simple File Sharing is not enable.
Ping from W7 to XP goes through.
The same log-on user name and password are used for XP and W7.
XP machine is visible from W7.
Error message is "Unknown user name or bad password. The same message when attempting to access from another W7.
Initially it was working but after an hour or so, it quits. I rebooted the router, XP machine and W7 machine but the situation remains unchanged. There is no problem networking between the two W7s.
Any suggestion is appreciated.

The post previously placed here was made by mistake so that I am deleting it.

Both in the same workgroup?

Firewall configured to allow file sharing on both machines?

just brew it! wrote:

Both in the same workgroup?

Firewall configured to allow file sharing on both machines?

The same workgroup name is used, and the firewalls are turned off at the both sides.