Severe corruption of .MOV files in Lightroom & unusable processing speed

Hi all,
I run on an Intel i7 quad core, 12 GB Ram, 2 GB Graphics Card (nvidia), Raid 0, 2x512 GB Harddisk space (1 TB), Windows Vista 64bit using the latest cut of Lightroom 3.4.1 64bit.
Using a Canon 7D with latest firmware updates, for RAW/JPG/MOV - this is the only source of all files that I currently use in Lightroom.
First Question regarding corruption of .MOV files:
Once I copy my files over from the camera onto my computer, I can play all .MOV files seemlessly with no flaws or hiccups (using multiple movie players), after I import the files in the directory (this includes the .JPG's, .RAW's, and .MOV's) into Lightroom, my .MOV files no longer play on my computer, the files begin to stutter and jolt, and are completely unusable. You can imagine my frustration as I've only recently added a huge chunk of my files to be cataloged by Lightroom, resulting in the last years worth of .MOV files being corrupted and ruined.
I am wondering if anyone has had this issue before and if they've found a way to fix it? I understand I could simply un-tick the import of .MOV files (and do so from now on), but I find it baffling that Lightroom is ruining the .MOV files - as it's not actually meant to touch the original files themselves is it? It's meant to add it's own layer of things to do to that file, stored in its own catalogue never meant to actually change the original files themselves.
Second question regarding unusable processing speed:
When DEVELOPing in Lightroom (I develop on two 24" monitors, both displaying at 1920x1200) it can take anywhere between 10-20 seconds for what I'm actually doing to take effect, ie. spot removal or changing the noise levels of a photo. My catalog currently has 10438 photos in it - is this overwhelming for Lightroom?
I love Lightroom and its functionality - when I first started using it these problems didn't seem to exist, so I'm unaware if it's an update or if it's just the increase in photos it has catalog'd that're bogging it down. I would love to resolve these matters as Lightroom is definitely where I want to be.
regards,
Emilio

Thanks for your response,
After what you said, in having absolutely no issue with .MOV files, I decided to ensure every drive on my computer was up-to-date and all software packages were final cut versions.
When I started playing my .MOV files (using VLC version 1.1.10 as standard), the files played fine after a graphics card update/VLC update/Windows system update/computer reboot (Lightroom NOT loaded) - So you are absolutely right, Lightroom is NOT in any way affecting my original .MOV Files, however:
When I then loaded Lightroom up, and started to then play my .MOV files (whilst Lightroom was running, and still using VLC (standard default player) (no other packages loaded), the files would begin to jolt/jitter/ struggle to play again.
If I monitor Task manager/Resources the only noticable heavy usage on Lightroom is having dedicated itself 1.7 GB of memory (not that much considering 12 GB is available), but also that clicking on any picture (whilst in grid-view, showing .CR2+.JPG as one, second monitor showing preview image) all of my 8 CPU's would spike to 90-100% for a second or so then drop down - fair enough.
I then close Lightroom and my .MOV files still don't play accurately - after a while (approx 30 minutes) my .MOV files will play seemlessly fine again.
So, I stand corrected that Lightroom is, in fact, NOT corrupting my files and regret my title choice, but is Lightroom doing something to my system which is making it hang/struggle whilst Lightroom seems to flush/go through its buffer?
Also what import preview do you set your catalog to? 1:1 then wait for it to complete the full import or standard?
Another major issue I'm having is when exporting multiple files (200+ or so), I notice the exporting process is fast initially then dramatically slows down my whole computer as all my RAM (the full 12 GB's) gets sucked up - after 60 or so photo exports Lightroom would have used the full 12 GB Ram I have available, and stopping the export does NOT free up the Ram - I need to completely close Lightroom (which then frees up the used RAM).
Thanks in advanced

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