Desktop & netbook WORKGROUP stopped working - help!

[jmp_78]

I have a desktop machine running Windows 7 64-bit, and a Samsung netbook running Windows XP 32-bit. I recently tried networking these for the first time, and set them both to the same WORKGROUP name. Immediately, I was able to share files (after setting the folder sharing where I wanted it) and have been able to for a month or so.

However all of a sudden, the desktop can see the netbook, but the netbook cannot see the desktop?!? The only thing that I can think that I have done is install Kaspersky Net Security 2010 on the netbook. It was always installed on the desktop.

Before I go ahead and uninstall it (to test the theory), can anyone shed any light on what may have happened, or what I ought to check?

Thanks in advance

 

[WasteTimeChangingCars]

I would try uninstalling your anti virus software first, if that fails try turning off your firewalls to see if that's causing any problems. You could also try doing a system restore on the computer that started having the problems in the first place just roll back to the last stable/working place you can remember.