The worst case scenario is that computer problems are so severe that Windows will not boot. Completely reinstalling Windows is sometimes the easiest way to fix things and it can be achieved fairly quickly, but that method wipes out the contents of the hard disk. As most computers are home to countless irreplaceable personal files, reinstallation should be regarded as a last resort. But if all else has failed and this is the only option available, what can be done to safeguard the valuable data that will be lost? In situations such as this, a copy of Linux can be helpful.

You don't have to install Linux alongside Windows. This is easier than many people believe but you risk overwriting files that need to be recovered. In September 2006 we looked at working with Damn Small Linux (DSL) (DSL information), a stripped down edition of Linux that is small enough to fit on a USB key or another CD.

Damn Small Linux can be run from CD or USB memory key without the need for installation, and this makes it possible to get to files stored on an otherwise inaccessible hard disk. These files can then be copied onto another USB key or copied across a network to another computer. As this live version of Linux will not interfere with or alter any files on your hard disk, backing up data in this way is a good first step regardless of what problems are being experienced, although it is a particular useful option if your hard disk has been rendered inaccessible.

DSL can also connect to the internet if you are using a broadband router. This means you may still surf and communicate, even if Windows is broken.
With a disc full of helpful recovery and diagnostic tools to hand, it is often easy to rescue a computer that seemed beyond help. As soon as a problem is discovered you can remind yourself that there is no need to panic.

It is too easy to rush in and make things worse. Take the time to use the tools you have copied onto disc to perform diagnostics to help decide what to do next.
Use this feature to familiarise yourself with the programs in advance.