LAN can access folder by one pc but not the other

[Guest]

Greeting everyone, to make it easy, I have put it into short detail:

PC01-older pc using windows xp pro SP1
PC02-newer pc using windows xp pro SP2
Linked together with Dlink DI604.

1)Both don't have firewall, using default hardware firewall from router
2)Dlink DI604 default setting, haven't touch anything
3)Both can online
4)Both on same workgroup, DHCP by router and router detect both pc
5)Both can play LAN game
6)Both can ping to each other
7)PC01 can access everything on both PC01 and PC02, delete,transfer files
8)PC02 can't see any folder in PC01, checking neighbourhood did shows PC01
but unauthorized to access.

Been frustrated for a week can't seem to make it work and nearly corrupt
PC01 in the process, lucky with the system restore. Can anyone know what
went wrong?
Thanks in advance.

 

[Guest]

Thanks to Chuck that discuss the similar problem with Neil, Chuck did it
again and solved my problem by changing the [HKLM \System \CurrentControlSet
\Control \Lsa], value restrictanonymous to 0

Can't imagine how the value would change to 1 automatically.

Thanks again, this thread can be close