I just bought a PNY 8 gig usb flash drive. I copied some files to it in Windows 7. I plugged the drive into a Windows XP computer and tried to delete the files. I keep getting 'Access Denied' messages. What's weird is that I was able to do a 'quick format' to erase the drive. However, I still can't write any new files to the drive (I checked for a write protect switch and I didn't find one). Does anyone know what is the deal with this drive and Windows XP