I hope I have your answer! I believe I reproduced this by copying the desktop.ini (hidden) file from the real my documents folder to any other named folder. This forces the look and feel of that folder to be My Documents even though it's something else.
To Fix Your Problem
- In explorer, navigate to the Tools->Folder Options menu
- Click on the View tab
- Find the Hidden files and folders item and under it, select Show hidden files, folders, and drives.
- Click OK
- In your %userprofile% folder, you need to identify the fake My Documents. Do this by opening the Property page of both items. One will have a tab named Location. This is your REAL My Documents folder.
- On the property page of the fake My Documents folder, click on the Security tab. This will show the location of the folder for your reference.
- Close the property pages and open up the fake folder
- Since you enabled Show hidden files in step #3, you will now see a transparent looking desktop file. Delete this file and return the previous folder. The original name of the folder will return. (Ignore the icon in my picture, I have this file associated with notepad++)