Continue using genuine windows?

I want to reformat my Windows SEVERAL Home Premium.
So once reformat I want to reinstall backside my OS IN THIS HANDSET.
POST still get valid item key.
Can one do that

yes which is what laptop shoppes complete and we have done it

most computer made by dell and other big names have a very hidden partition to get reinstalling the windows.

Just soon after your BIOS press F8 and you may get a recovery menu in the event you slect repair you’ll get to a further menu which usually should grant you the option to make use of a manufacturing area image, this will likely delete any information on your windows partition.