sharing folders on network

[mafiafromrussia]

ok i got a problem. 2 computers connected cia linksys router. both have xp pro installed. the problem is, on that i cannot access shared folders from new computer(192.168.1.100) those files that are on old computer (192.168.1.102) i get the error message on picture attached. but if i got from old computer to new a password thing pops up and asks for user name and pass, i enter login info from new computer and everything works. i also tryed to play a lan game and it worked fine. what could be the problem?

 

[Zedric]

You must set the permissions correctly on the old computer. "Simple file sharing" could be a factor.

 

[mafiafromrussia]

i have simple sharing unchecked on both computers. and when i go to sharing&security and share a folder i set everyone-fullcontrol