I know that a lot of members here have had some serious computer issues and asked for help.
I am a strong advocate of cloning your HD when it is work fine and being able to use that cloned image later if you have problems that can not be resolved. Serious infections, bad HD or whatever.
Anyway, until now I have not been able to recommend a good program for this that was also FREE.
Here is a cloning (or imagining if you prefer) program that is free and lets you create an image of your HD (or just a partition if you want) on a local drive, a networked drive, or a CD/DVD burnner.
www.macrium.com/reflectfree.asp
Should give you more info and also has the download.