i have a similar issue. my laptop battery is shot and doesnt work so every time my power cord comes loose the pc dies instantly. for whatever reason it sometimes wont start back up until i use a paperclip to hit that emergency switch (whatever its called) on the bottom of the pc. thing is, when it boots back up it destroys all my libraries under windows explorer. i have to delete the non-working categories, restore the defaults, and then manually point them to my media file folders all over again.
its really fucking annoying because my pc dies a lot and i need those libraries working to stream media to my 360.