With Acronis True Image you create an Emergency Boot Disk which you can use to boot your PC and reinstall your software from a CD/DVD or HDD. However, most people would find it quite time consuming to use CD/DVD-RWs as you will need a few and they are not as reliable as a HDD.
If you purchase ATI `in a box` the disk provided will act as the source for everything you will need - you can install the software and it can be booted from in an emergency. If you download ATI you will need to burn your own Emergency Boot Disk using the installed ATI software - this should be a priority job. I should add that you can burn as many Emergency Boot Disks as you want from either source of the software.
If you simply want a boot disk to let you get into your PC in an emergency you could look at the Ultimate Boot CD click here