USB flash drives not working at the college i work at!?

[gingaman]

hi, some of the students who come into our central learning centre at college try to use their USB flash drives but nothing shows up, in some cases the disk appears in my computer but appear not to contain anything and other occasions they just dont appear, iv checked all the settings and all the ports are configured to allow access to te usb drives, its really strange, i canget any usb dsk to open and run on my laptop but they wont work on the workstations themselves? anyone got any ideas? it would really help. thanx, James