Ok. Boot up in the morning, WIN XP, sp3, work through the day, no
problem. Suddenly, POW, no more network drives.

I can ping anywhere I want, including every single server in our tree.
If I open a login box, and hit advanced, then trees, after a few seconds
I am presented with a box that contains "mytree". and nothing else, just
like it is supposed to. If I then choose that tree, and hit the Context
button, after a few seconds, I get an error which says "Cannot find
tree", which of course, it just found when I hit the TREE button. Hit
the TREE button again, there is my tree. Hit context, "can't find tree."

Must shut machine down and restart to fix it...
For about a week now...
about the time I installed SP3 for XP on this system...