Vista - WMC Erasing Video Recordings & Automatically Scheduling Recordings

I had 13 videos erased from from my hard drive by WMC. At the time I had 32%
of the hard drive capacity available.

I logged on one morning, all 13 were gone from the recorded list. I
happened to look at the programs scheduled and WMC had on its own searched
the TV listings and scheduled future recordings of the listings that were
available.

AI or what? I do not want to have the recordings erased again. No one at
HP or MS has any information on this wierd occurrance.

What gives?