Computer cant open sansa clip

Make sure the lock switch isn't engaged.
Double-click My Computer, and see if there is a Sansa icon (some computers will only show it as a removable drive or an MTP device).

If the computer is not recognizing the player:
disconnect the player from the computer, turn it off, hold in the volume + button, and reconnect the player to the computer while holding the volume + button in. Keep holding the volume + button for an additional 5-50 seconds. Windows should eventually go into recovery mode and revive the player- it will pop up a window that says Found New Hardware Wizard.
If you get the problem where MTP Device keeps popping up continuously, uninstall the “MTP Device” by going to Start à Control Panel àSystem à Hardware à Device Manager (you computer may vary slightly, depending on Windows Version).

-Tha Mp3 Doctor