The drive structure may be
corrupted so run a chkdsk on each drive
Go to run->cmd->chkdsk c:
Repeat this step to other drives by replacing C:\ with other letters
if the problem does not solves then there may be autorun virus
Auto run virus. just enable show all files including the hidden and system files and delete the entry in the root of each drive autorun.inf
- ATTRIB -H -R -S C:\AUTORUN.INF - unhides the hidden file autorun.inf
- DEL C:\AUTORUN.INF
- Repeat this step to other drives by replacing C:\ with other letters
And for future security install the usb disk security