I changed my setting to MSC and I noticed that when I went to My Computer, it was finally recognizing the Sansa Clip. I did that because I read this in the manual:
Auto Detect or MTP mode - The ability to change between Auto Detect and MTP (Media Transfer Protocol) mode for the Sansa Clip Zip MP3 player is found under device system settings when USB Mode is highlighted. Auto Detect (best) and MTP mode are used for Windows Media Player functionality. Be sure that either Auto Detect or MTP mode is selected to connect to a Windows computer.
If your player does not connect:
1. Unplug the player
2. Select Settings
3. Select System Settings
4. Select USB Mode
5. Change the USB Mode from Auto Detect to MSC
6. Plug your player back into your PC
After doing this, the window on the clip soon went dark and I could not tell if it was charging, so I left it plugged in to the computer for a while because the computer was still recognizing it. When i went back and checked it, the clip was fully charged. I think that a lot of people thingk that the computer is not charging the clip because the window goes dark.