I'm locking this one, as the other one has more details.
When I put the flash drive in usb port my computer running XP gives found new hardware wizard window it has recognized it as USB Disk 2.0
When i go through installation it states
Cannot install hardware
Software was not found.
i have 2 other 256mb sticks which are recognized instantly as removable drive J:
Also the 4gb was recognised on 2 other computers my sons and my works . they both run XP as well. What can the problem be?