Palm Desktop/HotSync Installation Failure and USB unknown device- Dell XPS 400

I have tried unsuccessfully to install Palm Desktop/Hotsync for my VerizonWireless Treo 650. The program stalls just when Hotsync loads to the system tray. I have to use task manager to get out of it. Although the program seems functional, when I try to hotsync, a get a USB unknown device error.

Uninstalling using Windows also stalls at the last step, requiring task manager to close the window.

I have also installed Palm Desktop Version 4.14e without a hitch, but I get the same USB unknown device error.

I have contacted both the Palm software and Verizon Wireless support staff, but neither know what the problem is.

Is there a known incompatibility with the Dell XPS Windows XP Media Center and Palm Hotsync? I have loaded it on other computers with Windows XP Pro, Home, and Media Center operating systems without a problem. Only the Dell computer gives me the above errors.

Thanks in advance,
Dennis