SHARING: Network share not accessible. Do not have permissions.

I have read many posts on possible solutions to this problem for windows xp pro. Nothing has worked. I can view the computer over the network and but cannot access the files. Also, using my the same computer whose resources im trying to access, I cannot access them going through the workgroup to get to my files. I have tried to restricted anonymous settings in regedit as well as a few other things. Any ideas and information will help. Thanks.