Manually connect in MSC mode. Start with the Clip OFF, slide the power switch down to the HOLD position (orange). Press and HOLD the center button depressed until the PC recognizes the Clip (usually in a few seconds).
The Clip will display the Connected icon on its display. You can then release the button.
Right click on My Computer and select Manage. Below Storage, select Disk Management. The CLIP will appear in the upper right of the list pane. Right click on the CLIP. Select Properties. In the new pop-up, click on the Tools tab. Lastly, click on the Check Now button under Error-Checking.
This should recover your Clip.
Slide the power switch back to OFF, and once the PC is done looking at your Clip, unplug.