lee wrote:EDIT: Just tried it but the connections are completely different to the other computers.

Sounds like it may be a sata drive, theres only 2 kinds of hard drive connectors, IDE (and the small ide for laptops) and SATA, the newest of the bunch.
There are adaptors available that will connect direct from the hard drive to USB, I recently picked some up from Ebay, well IDE ones, they effectively turn the hard drive into a portable hard drive without the casing.
Great piece of kit to have about, but I have no idea if they are available in Thailand, I would have thought so, the one I recently bought was made there surprisingly.
Just try googling for SATA to USB cable, failing that dealextreme.com have them in China, only a few days by post apparently.
Before you comit to purchase though, it may be worth getting a set of IDE to USB cables as well, just incase you ever need them in the future.
This will enable you to back up the relevent files you need to keep, but dont mess with any windows folders or you'll be asking for trouble if you want to try and keep the drive intact.
I have never tried what you said about writing over the boot ini file, may work or may not, not 100% sure on that one.
I presume when you tried Hirens in the cd slot, you set the bios to boot from cd not just selecting on the boot screen, if not give that a try as sometimes windows can over ride the setting.
Also double check that the Hirens disc is ok on another system, as burning too fast can sometimes let it slip a little.