When you open the My Computer screen and your Documents folder is missing but all the other users folders are there try this tweak.

STEP 1:

START >  RUN > REGEDIT >

HKEY_LOCAL_MACHINE / Software / Microsoft / Windows / Current Version / Explorer / DocFolderPaths

Once you click the DocFolderPaths folder you should see all the user's folders. 

STEP 2:

Add a new string value

Value Name: your user name

Value Data:  the path to your docs folder ( ex. C:\Documents and Settings\your docs folder )

Exit Registry editor and open my computer, your docs folder should now be visable.

I hope this helps those of you stranded with this problem!