Hi
Are you using a router between your PC and SMP? I had the same problem and I had to put the router in a different Workgroup name. The SMP network capabilities are just bad. Many people out there have problems with shares.
But with a little endurance you may find a soluttion probably…
Try to put your PC and SMP on a dedicated workgroup.
I got this link as help from tony. It didnt helped me but maybe you have better luck with it.