XP network sharing problem

Question

I have a PC (running XP home) with an external HD and a printer attached to it (USB).Both are set to share with the computers on the network and "Allow network users to change my files" is checked as well for the external HD.I have a home network through my wireless router, and a total of 3 computers access the WiFi (the above mentioned computer and 2 others). I would like the 2 other computers to be able to share the printer as well as the external HD of the desktop. Currently both computers are able to print through the printer and both computers were able to access and use the external HD - great.Something happened about a month ago where one of the computers (running XP Professional) stopped being able to access the HD. It still can print but it gets some errors accessing the HD:The HD is not accessible.You might not have permission.Not enough server storage is available. There should not be any permission issues - it is allowed on the desktop and in fact the other wireless laptop can access the HD. It doesn't seem to be a connetivity issue b/c it shares the printer to this computer just fine. There is plenty of space on all the computers as well as the HDWhat I tried was to delete the HD from my network places and then re-instate it. That didn't work either.Any suggestions?Thanks,Michael