The UBCD can be your savior when your PC behaves like a spoilt brat
The Ultimate Boot CD or UBCD from www.ultimatebootcd.com is a bootable CD based on Linux. It contains a host of precious tools and utilities, which everyone in general, and computer hardware professionals in particular will find useful. UBCD contains many tools that will let you service and maintain your computer. There are tools that let you diagnose problems with your computer and there are tools that let you repair those problems. Even if you are not able to boot from your computer due to a hard drive failure, you can boot from this CD. You can then run diagnostic programs to check the problem.
Burn the UBCD image to a blank CD. Now set the affected computer to boot from the CD. Insert the UBCD into the drive and you will now boot via UBCD. Also keep in mind that you need a good hard drive with capacity, more than the amount of data to be recovered. Connect this hard drive into the computer. In the main menu, you will see many options such as System, CPU, Memory, HDD, BIOS, Peripherals, etc. While there are numerous utilities, we shall mention a few to get you started.
i think Hiren's Boot CD is not completely legal, so i dont think it will feature on this site. UBCD consists of completely freeware, but Hiren's has some illegal content
i always trust UBSD4WIN, when it comes to rescue and recovery of the systems. using it from past 4 years, earlier it was known as BartCD, if i am right. a really trustworthy and useful freeware. unless u dont mess deeply with compiler. just update the driverpacks, and anti viruses, and go on.
I have found Hiren's Boot CD to be more useful for my Windows system. I haven't tried anything on Linux but it is certainly recommended when your OS crashes and you want to back up important files in C Drive before formatting your OS partition.