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W7 First, please disconnect all USB devices and then perform the following steps: Click 'Start' button, type 'devmgmt.msc' (without quotation marks) in the 'Search' bar and press 'Enter'. Click 'Continue' if necessary. In Device Manager, double click to expand 'Universal Serial Bus controllers', right click on the Host Controller, click 'Uninstall' and click 'OK'.

Repeat the step 2 to uninstall all items under 'Universal Serial Bus controllers'. Then, restart your computer and Windows 7 will reinstall all USB controllers automatically. For xp click start control panel administrative tools computer management device manager scroll down universal serial bus controllers you could see a yellow question / exclamation mark?! The drivers might not be installed for this device check the leads that attach to your external hard drive make sure connections are good and leads are good click start control panel administrive tools computer management device manager scroll down universal serial bus controllers you could see a yellow question / exclamation mark?! Or a red X you will need to update/reinstall drivers right click to reinstall drivers if you can see your usb drive but its not working ports(com&lpt)right click update driver if this fails to fix the problem check the USB leads that attach to the motherboard usually red white green black make sure they are securely seated and have no dust build up on them dust will cause static and a lot of unforeseen problems for a computer and its parts hope this helps you Sep 13, 2011 . If you are having trouble with your drivers here is a general look at the drivers and how to update them if your computer came with a motherboard disc the drivers could be on it click start control panel administrive tools,computer management,device manager look through all of your devices if you see a yellow question mark?or exclamation mark!

Or red x right click to reinstall drivers or if you can see your usb but its not working ports(com&lpt)right click update driver hope this helps Apr 23, 2011 .