Right,

2x computers (main PC (upstairs - wired), media PC (downstairs - wired) and laptop (wireless)

NAS server with integral 3x wired router and wireless access point.

All computers connected to Server, can get on it and use/copy/delete files

Yesterday I had no problem accessing the shared folders from one PC on another PC (eg, I could access My Documents or Shared folder on my main PC on my Media PC, or put something in the shared folder on my Main PC and access it from my Laptop)

Reinstalled the OS again on my laptop today (I was messing around with the registry again ) so just setting it up on the network again....

But for some reason I can't access my Main PC. I can see it on the network but I get an error message saying it can't access it, contact admin to allow access and says the network path was not found. It also does the same thing if I try and access my laptop from my main PC, says network path was not found but I can see "the computer" in MY NETWORK PLACES > WORKGROUP COMPUTERS. Sharing is turned on for all computers, so why can't I access anything?

When I did the OS last week on the lappy, I did all the same thing and had no problem accessing my main PC shared folders from the lappy as I was downloading stuff on my main PC, then accessing the files from the lappy in order to installed the drivers, software etc....

Whats stopping me from doing it this time?