Robert:
Just last month I removed, disassembled, lubed and replaced both my power
window motors after setting the guiness world record for the slowest moving
power window.  By the time I was able to get the windows rolled down the
seasons would change and I needed them up again.

Anyway, I followed Mark Keller's advice and cleaned the existing motors up
and now I am amazed at how quickly they roll up and down.  They are fitted
with a friction sleeve (just made that term up) type bearing with not a
ball bearing to be found.  So, they are subject to corrosion and slowing to
the point where they start blowing fuses.

I've got some pics showing the process out on my site if you care to see
them.  Go to http://www.weidefamily.net/vanagon/
See the Electrical > Power Window section  and look for Power Window Motor
Rehab.

Good Luck,
Brent

ps:  On the subject of window switches....You'll have a dickens of a time
getting them back together once you pry them apart.  Unless you have a LOT
of time on your hands, I recommend replacment if you doubt their soundness.