Can't map network drive

ComputerA is cabled to a router for internet feed and the
router is connected to a wireless access point which is
connected to wireless computerB. Both computers run XP SP2.

ComputerA can access ComputerB C$ but ComputerB cannot
access ComputerA C$. A computerB attempt to Map Network
Drive fails with "Access is denied," as does command-line
net use... . Both computers access the internet and
computerB can print to a computerA printer.

The computers use the same account name and password; both
are administrators. For printer and file sharing NetBEUI
protocol is used. Software firewall is disabled. Simple file
sharing is enabled. No NTFS permission has been knowingly
changed.

I've done a lot of web and MSKB searching, including
www.ezlan.net, without being able to find a diagnostic
procedure. Any suggestions?

--David

I disabled Simple File Sharing and the problem disappeared.
No idea why.
--D

J David Ellis wrote:
> ComputerA is cabled to a router for internet feed and the router is
> connected to a wireless access point which is connected to wireless
> computerB. Both computers run XP SP2.
>
> ComputerA can access ComputerB C$ but ComputerB cannot access ComputerA
> C$. A computerB attempt to Map Network Drive fails with "Access is
> denied," as does command-line net use... . Both computers access the
> internet and computerB can print to a computerA printer.
>
> The computers use the same account name and password; both are
> administrators. For printer and file sharing NetBEUI protocol is used.
> Software firewall is disabled. Simple file sharing is enabled. No NTFS
> permission has been knowingly changed.
>
> I've done a lot of web and MSKB searching, including www.ezlan.net,
> without being able to find a diagnostic procedure. Any suggestions?
>
> --David