Not sure it is the same case, but this post may help.
Network and sharing center freezes ...Posted: Tue Dec 11, 2007 8:00 am Post
subject: Network and sharing center freezes, server execution failed, Reply
with quote ...
Bob Lin, MS-MVP, MCSE & CNE
Networking, Internet, Routing, VPN Troubleshooting on
How to Setup Windows, Network, VPN & Remote Access on
"jaerha" <email@example.com> wrote in message
> it will work for 3 or 4 minutes after rebooting PC after that it only
> a blank box. Initialy I can view all devices on the network but this also
> becomes impossible after 3 or 4 minutes. On the other hand mapped drives
> the network can allways be reched. Please is there any one that knows what
> with thanks