I manage the computer network for a small non-profit company. They have very little money and have only recently upgraded their system enough to run Windows XP Pro on a few computers (all their others are Win2000). They have a Windows SBS 2003 Server controlling the domain. None of the Win2k computers have any trouble with the network.
There's something weird going on with the WinXP Pro computers, though. There are three, and all of them have this problem: their connection to the network seems to degrade over time. This is most noticable with the network printer, a Canon ImageRunner 210. When first booting up, the computers print just fine, but after a couple hours it starts taking a long time for the print dialog box to appear. Eventually, it just won't be able to connect anymore and they'll need to restart to print.
But it's not JUST the printer - browsing network drives gets increasingly slow as time goes on.
I am not a network professional, just a nonprofit worker, so much of this is over my head. I'm not even sure how to diagnose this problem, much less fix it - can anyone point me in the right direction on where to look to find the solution for this problem? I've tried googling various phrases, but so far nothing has come up.
EDIT: I ran event viewer, and get the following errors every time I startup: