It's messy, but you could try the registry.
Run regedit (hit Start or Win+R, type "regedit" without quotes, hit Enter, approve UAC prompt).
Go to HKEY_CURRENT_USER\Software\Microsoft\Windows\Curre ntVersion\Explorer\Shell Folders
Edit the strings in the relevant registry values, such as "My Pictures".
Log out and log in again (or just restart).
I can't promise it will work - your error is weird and I've never seen it before - but hopefully it will.