File Sharing - XP to XP - stopped working

[Guest SteveS]

I use a desktop & laptop (both XP-HE) and I have shared files/printer between

them for several years using a wired/wireless router. In July I lost the

ability to share between them, though both can connect to the internet

through the router/network. When I Explore the desktop's Network folders, it

can be seen with its shared files in the established workgroup - the laptop

is not visible When I Explore the laptop's Network folders I see the

established workgroup, but nothing shows up in the workgroup and I get the

" is not accessible. You might not have permission ... " error

message. Note: while it may be just coincidence this problem occurred

concurrent with a new Vista machine connecting to the network. The Vista

machine works fine with the network and the desktop, but I have lost the

ability to share files/printer with my XP laptop.