Reset OS to when it was first installed

Do I have to use a DVD-r or DVD+r to burn it? or can I use a CD-R disk to burn the iso?
 

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OS
Windows 7 Ultimate
Do I have to use a DVD-r or DVD+r to burn it? or can I use a CD-R disk to burn the iso?

The installer is 2.34gb which requires a DVD. You can get good quality DVD's 3 for $2 on the wall rack at Walgreens.
 
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