Vista - Games Explorer

A lot of my games didn't download art etc in the game explorer on Vista.

After much messing I found the registry key's where all the info is sitting,
but it seems to ignore any changes I make except for title. If I change any
of the fields, the changes won't be reflected in the explorer, unless I
change title, where refreshing shows the new value straight away.

Also after some google'ing around a bit, I found out all of Vista's (legacy)
game info comes from 'http://www.allmediaguide.com/' which surprised me
because all of the games that won't update are listed on there.

I noted in the registry a key called "WMGameId" and on the media guide I
noted an "AMG Game ID", does anyone know the relationship between the 2, like
how to change the WMGameId so it will download the necessary info.

Ok, that question makes no sense, but hopefully you can see what I'm getting
at.