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23 Mar 2009  
Night Hawk

Windows 7 Ultimate x64, W10 Preview - Second remote tower Windows 7 Pro x64
 
 

The roll back option is the "roll back setup" option available before any actual and final changes are made only seen when first running the installer.

For most running a laptop the option of first shrinking down the XP primary to make room for a second new one created for 7 to go on would see a dual boot where you can simply nuke the 7 primary later leaving XP intact. You would want at least 25-30gb of drive space available for that maybe more depending on how many programs you end up installing.
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