“The Avira AntiVir Rescue System a linux-based application that allows accessing computers that cannot be booted anymore. Thus it is possible to repair a damaged system, to rescue data or to scan the system for virus infections. Just double-click on the rescue system package to burn it to a CD/DVD. You can then use this CD/DVD to boot your computer. The Avira AntiVir Rescue System is updated several times a day so that the most recent security updates are always available.”
Another great tool to scan a system that will not boot/startup, maybe due to viruses, spyware or malware. The only drawback is you must download the iso or exe file and re-burn CD disk, for it does not automatically update. I use Re-Writable CD’s and have one labeled as “Avira AntiVir Rescue CD”. I re-download file and erase my Re-Writable CD, and burn updated copy if copy is more than few days old.