Thumbdrive memory

I have a PQ1 U230 1GB and a SanDisk 1GB. After installing Vista, my system
will not read the PQ1, SanDisk works okay. I have plugged the PQ1 in other
computers with XP and it works okay. Also, my system reads a CompactFlash
card reader okay. I have tired different USB ports with no success. My system
makes the sound and the CPU meter shows it is reading it, but the drive does
not show up. My system ranks 4.2 and everything else checks out okay.

Any suggestions?