NW 5.1 server SP7, NW Client

Problem: 2 new WinXP workstations log out (or shut down) very slowly
15-20 min if at all. Occasionally they shut OK. Older WinXP workstations
don’t have that problem. I suspect it is a client issue. Or Panda
antivirus issue. Or LAN issue. Or …? What would you suggest?
Perhaps to make sure that the clients (configurations) are identical?

Erkki Ranta