Remote control

On some remote PC, I can log in and work around the PC but I cannot access File transfert, it tells me ‘‘Fails to get file list from remote…’’ at the bottom. This is only on some computor. What do I have to change on other PC to make it works. I tried and activated file shating but that didn’t help. Any idea?
THKS

Got to find out it is not working only with XP either with both XP to XP or to/or from vista or win7. So the problem is related to XP only. THKS

I am sorry if I mislead on the answer. The only time it is not working is whe XP is the Remote machine. Working from XP Local to Win7 Remote but not the inverse. Also not working from XP to XP. Must be a protection in XP sharing but I activated it. THKS.