vista hangs after login - seems specific to user

I did a clean install of Vista Business, it was working fine for a
while, then it started hanging about 30 seconds after I logged into
the administrator account every single time. So I booted in safe mode
and logged into administrator (it worked) and ran MSCONFIG and
disabled just about everything I could think of, then rebooted
normally and logged back into administrator. It still hung. So I
then rolled back to a previously known good config from a couple of
weeks prior, but that didn't help.

I had an alternate user account I had created and logged into that.
It worked!!! No more hangs..... then........ I remote desktopped in
from my wife's XP machine. I connected for a couple of minutes, the
RDP stopped responding. I went upstairs to my machine and it was
hung. I rebooted it, logged back into the second user and now
experienced the same behavior as the administrator account.

I'm stumped, the only way I can log into Vista now is in safe mode.
I'm now back in XP wondering how I can continue to troubleshoot this
problem.

Thanks for any ideas.