Hum something is having a go at you TK.
I suppose like Gary has aid a reinstall would be the go. Now have you got any installation disk or can you get hold of another machine download the ISO - put in a new drive and install onto it and use the activation code from the sticker on the machine?
You will of course need a machine to make an ISO with and well new drives are not that expensive now. If you are worried about changing the drive if there is someway you can post a shot of the underside of the machine I can tell you how to do that.
It is usually just a matter of removing the power supplies (cable and battery) undoing a couple of screws opening the small door / lid and gently sliding out the drive. Now you will need to put the new drive into that small carrier by undoing the screws at the sides then put the new one in screw it up and slide the new drive back in and refix the lid down.
Then set the BIOS to boot from whatever you put the ISO on and install.
Sounds really hard but truly it is easy.
The ISO I don't know if I am allowed to post here so PM me.
Once in you can at leisure then get your data you need back onto the drive if you have some way of retrieving it.
Hum I have just had a look at the thing being done and well it is a whole lot different to other stuff I have fixed seems the whole bottom had to come off - so unless you can follow this Yuoube vis well looks like the techs are going to make a killing. http://www.youtube.com/watch?v=rg_GvaMunas