There is an old Windows XP KB article that was recently updated with additional steps to resolve these types of issues. The KB covers Windows XP, Windows Vista and Windows 7 with step by step methods. See if this helps.
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Do you have this problem with only one specific USB dvice or all the devices?
Unplug the device, try in a different port and check if it helps.
Uninstall the device driver from device manager and restart the computer. Computer will recognise the device and install drivers automatically.
1. Go to device manager and righ click on the flash drive and click uninstall.
2. Restart the computer.
Refer this link to troubleshoot problems with USB devices:
This link is for Windows Vista but it also applies for Windows 7.
You may also update the chipset drivers. You can download the latest drivers for Windows 7 from the manufacturer’s website.
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