Unmountable Disk Volume and BSOD

I have a Compaq Presario CQ70 Notebook PC, upgraded from Vista to Windows 7.

This morning when I tried to start up windows I get a Windows Error Recovery message with two choices: Launch Startup Repair and Start Windows Normally.
With repair it starts loading windows files and then starts loading windows, but It gets interrupted and turn black with a mouse pointer. ctrl+alt+delete does not respond nor does sticky keys (5xshift).
When I start windows normally, It does load windows but gets interrupted again but this time with a blue screen what says Unmountable Disk Volume.

However, I am able to go into BIOS and advanced boot options.
I've tried Safe Mode but I get the blue screen with the UDV error again. I've tried using a bootable repair cd, it does respond but after loading the files I get the black screen again. I also done the hard disk self test which I failed saying to replace hard disk 1 but I passed the SMART test.
Is the hard disk completely broken or will I be able to safe my files on it?

Can anyone help me with this problem?

Do you know where to find the manufacturer of the hard drive?

Check with a hard drive diagnostic tools.

Hard Drive Diagnostics Tools and Utilities (Storage) - TACKtech Corp.

Thanks nickle and theog.

I have a Samsung hdd and downloaded the diagnostics tools, but I had some problems using it. I looked on the internet and was recommended Seatools instead.

I did a short test and a long test which I both failed, and in the long test I had about 90 errors. Afterwards, it told me it has failed some kind of critical test, so I'm going to backup my files using Ubunto and then I'll format my drive somehow and reinstall windows.

Thanks for your help. I'll will keep you updated if anything would still occur.

Thanks usasma,

Luckily I still have a warranty for it and should have no problem getting a new one.
And I have my files as well, so I'm not worried about it anymore.