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First make sure that your backup data is stored on D drive , Then do the reformat on C drive and reinstall windows , Once windows is install and you are back up and running your computer ? You then can transfer your data from the D drive onto the C drive , Once that is done you can reformat the D drive from within the Computer Management / Disk Management area , If you right click the " My Computer " select " Manager" , Expand the Storage area , you then will see the Disk management area , You will notice your drives and in your case you would right click on the D drive and select format , But reformating the D drive isn't necessary if you just want to reformat windows ? You can if you feel like it ... If I was you ? I would burn onto dvd disc your back up data , Just to be on the safe side ...
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