Type Device Manager in the Search bar and press "Enter". Press "Ctrl + Esc" to open the Start Menu. Reinstall USB controllers using the Keyboard = First, please disconnect all USB devices. In addition, please open the Device Manager to check if there is any Unknown Device in Device Manger after connecting the player If it still failed to work in the two modes, it's better to remove the USB controllers. After that, please test your player in the in MSC mode or MTP mode again.
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Now, please update your drivers for you laptop, espically for the Chipset, BIOS, you can get them from the following link according to your system version. In addition, you can try to connect the player via the MSC mode, you can refer to Then click Action on the top menu then select Scan for hardware changes, or restart your machine to test. You just need right-click the entry with the error mark, select Uninstall. If there is a yellow exclamation point (!) or question mark (?) beside the device, try to reinstall the drivers. Portable Device (if the player is set to MTP mode) USB Mass Storage device (if the player is set to MSC) 2. Generally, the Sansa player will show up on Device Manager's right pane as: 1. MTP mode is the recommended and default method for Sansa Players when used with Windows OS. Exceptions are Sansa Connect and Sansa Express which only use MTP mode. Note: the Sansa MP3 Players can connect to your computer in MSC or MTP mode. If it is compatible with Win7, please check if there is unknow device in Device Manger after connecting the player. After that, please check if your player is compatible with Win7, you can check it in the following link: I suggest you to update your drivers for your Win7 machine from the manufacture, espically for the Chipset driver. Do you recall when the issue first occur? Can you let us know your detail model of your machine and Mp3 player? Have you tried to connect the Sansa player via another USB port?