My Adventures at the Genius Bar! or, the Pan-dimensional Apple Mystery Tour!!

 I recently started having all sorts of issues with my MacBook Pro with 10.6.2 on it. A lot of NULLS to what appeared to be RAM sectors, doClips repeating 100's of times, and panics. I initially did an Archive and Install... To no avail. I then attempted an Erase and Install, with similar results. I even slid in the old 10.4.11 disk to do the AHT. NADA! I took it in to the Genius Bar for a thorough going over. After 2+ days in Apple's possession, they found nothing wrong. I was informed that they made sure all of the pertinent updates were installed. I get home and fire it up. I have a quick look at the Console to see whats shaking. Close that. I begin to peruse my OS to see how things look and all of a sudden come across an .SPX file in my downloads folder... This is not a mac file to my knowledge. I click to open, 'cause I figure it's a fresh install with no other apps installed by me AT ALL. The file opens and voila' it is someone else's system profile, down to the nitty-gritty, sitting on my computer!! I was a bit alarmed at this and contacted the Apple store to discuss this. I asked how this could happen.... Was my Mac connected to their network? Did someone TargetD the thing? I was told that none of this could have occurred. It scares me because I literally had everything about this other persons profile, network IP's, programs used, etc. The really strange thing about all of this... The other computer has never even seen this country's shores, according to the manager!! Now, don’t get me wrong, I’ve had many more problems with a P.C. running WinBlows in any iteration than I’ve ever had with my Mac. I have also had an awesome experience any time I deal with Apple and their customer service. But this is re-Goddamn-diculous!! Seems like a pretty serious fuck-up to me!!
Anybody have any idea's????

ANGRY BRADY