Hiren's bootcd is a completely free bootable CD that contains a load of useful tools you can make use of in a variety of situations like analyzing, recovering and fixing your computer even if the primary operating system can not be booted.

It is a great resource for anyone with computer problems who is having trouble accessing the internet to download programs in an attempt to fix it. It has a multitude of tools divided into a number of categories like partitioning tools, backup, recovery and BIOS/CMOS tools to name a few. With some simple knowledge about what is contained on the CD, you can use it to repair many problems computer like hard drive failure, virus infections, partitioning, password recovery and data recovery. Hiren's bootcd has an extensive list of software. Utilities with similar functionality on the CD are grouped together and seem redundant; however, they present choices through UI's differences and options in what they can do.