My Macbook Pro Won't boot. Unable to find the driver for this platform

Hi there,
After doing some casual internet browsing earlier today (facebook + twitter etc) my laptop froze up. While I was able to click between windows, the ever faithful beach ball was there to ensure I couldn't really do anything, including making the dock appear when mousing towards the bottom. So I held down the power button to shut it down, and restarted. After the apple logo had sat there for quite some time I got a message something along the lines of:
Unable to find driver for this platform:\"ACPI\".In"@/SourceCache/xnu/xnu-1699.32.7/iokit/kernel
This was followed by a message telling me I needed to restart my computer using the power button. After several attempts all producing the same results, I was still in the same boat. So I sought some online help which lead me to boot into my recovery partition (holding down the option key at startup) and install the operating system again from there. However this is when I really started to panic. After selecting the recoverey partition the apple logo flipped between a no access symbol (that circle with a line through it) and the apple logo for a couple of seconds, before settling on the apple logo. But the recovery partition never loads and after some time I either get a symbol of a folder with a question mark in it or I similar message telling me to restart.
Next I tried plugging in my external hard drive with a few time machine backups as well as a carbon copy back up and another recovery partition. Using the external HD's recovery partition took me to a menu which the online help had initially promised where I could reinstall osx as well as use disc utitlity. So I tried to run the installer from here only to find my hard drive didn't show up in the list of destination volumes. The time machine and recovery partitions from my hard drives did, but I couldn't select these.
I then turned my attention to the disc utility and tried to repair my hard drive. I was unsure which one to select at first because there were two names for my hard drive; the first being the hard drives actual name (a samsung something or other) and the second was called 'Lion.' I started by repairing the samsung one and this was over in a few seconds saying it was successfully repaired. So I moved on to 'Lion' and this took a few moments, before stalling on a section saying "Updating boot support partitions for the volume as required." I was also advised to recover any data I could and restore I backup.
So that's where I'm currently at. I'd really hate to lose any recent data, as my last time machine back up was about a week ago and I'd made some substantial progress on a mix since then!
I'd really appreciate any help that anyone can offer,
Cheers!

Just had another look in the disc utility and found that the samsung's partition scheme is set to master boot record, which is apprently used for windows partitions? I've no idea how this happend because When I originally formatted the drive I'm sure I would have set it to GUID partition table. Clicking on 'Lion' just gives dashes for the partition type, capacity and available space values.

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