Networking To XP (wireless): List Files The Connection Timesout And Gives An Error Os Dennied Access To The Shared Folder

using the laptop through wireless I can see other computer and even list their shared folders but when I try to actually list files the connection timesout and gives an error os dennied access to the shared folder. If I try to use VNC for instance, the client connects, asks for pass and then after the remote screen starts to appear.. it hangs... no response after that . The strange part of the problem is that if I connect the laptop through a wired connection everything works ok I access shared folders, I print remotely, no problems. I tried a number of things , the most obvious, like firewalls diferent settings on the network etc. What I can't figure out is what can be so different in the PC for the wired to work but not the wireless.