I always had problems with WRA and it never worked reliably, also I often need to do what I need to without relatives being at their computer. They just turn TV on (letting me know the code/pwd) and I can do what I need to at my leisure. WRA isn't that secure either. It all may be better in W8...
Do what I do with relatives
1. backup all files (and pst files, bookmark/favourites etc.).
2. Clean install (if possible) and updates. Failing that, uninstall all crap, run CCleaner and Malwarebytes.
3. Create an Admin user with a password only you know.
4. Set their user to be a Standard one...