USB memory stick problem

A couple days ago a few of our computers was upgraded from XP Home to XP Pro.

One of the problems that surfaced was that you couldn’t se any usb memory that were connected in Explorer.

The funny thing is that you can see them in the Diskmanagement tool.

I have tried to update the computers chipset and usb drives and disabled the usb 2 support in Device Managmentand bios.

What should I do?

PS! You have to excuase the bad grammer but english is not my native tounge.DDS