Yesterday I plugged in a symbol usb scanner to a lenovlo T510 laptop running windows 7. Last night i shutdown and this morning the computer doesn't find the usb device. I witll find a microsoft nano mouse and a usb expansion hub but not the symbol scanner.

Hi, How about trying another USB port? What did Device Manage show? Nothing or yellow exclamation mark? Does the device work on other Windows 7 computers? I suggest downloading the latest printer driver from the manufacture's site and reinstalling the USB controllers to check the result. If any USB hub is used, bypass it. http://blogs.technet.com/b/asiasupp/archive/2010/11/23/error-message-one-of-the-usb-device-attached-to-this-computer-has-malfunctioned-and-windows-does-not-recognise-it.aspx Also try the Device Clean Boot. 1. Click Start, type "devmgmt.msc" (without quotation marks) in the Search bar and press Enter. 2. Expand "Sound, video and game controllers". 3. Right click on your sound card and then click "Properties. 4. In the dropdown menu of Device Usage, please choose "Do not use this device (disable)" and click OK. 5. Please use the same method to disable other dubious hardware such as: internal modem, network card and CD-R drive. Please note some devices such as video adapter are not available to be disabled. After that, restart the computer and then test the issue. If it does not occur, you can enable the device one by one to narrow down this issue. Best Regards, Niki Please remember to click "Mark as Answer" on the post that helps you, and to click "Unmark as Answer" if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.