Have you installed any new programs lately?
A couple of things to try that help some but not all. If you have a USB 2 port try it, a USB 2 port will allow for more power to the Axim if needed. If you have the correct cable you might want to try using a serial connection (something about USB drives).
I had the similar problem and used system restore to go back to a point where I knew everything was working O.K., this fixed my problem.
Let us know....
:D
We posted at the same time

, glad you got it going. Now there is another thing to try...