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1. Get rid of Vista
2. You cannot dual boot Windows 10 and Windows 8, unless you buy a retail copy of Windows 10.
Windows 10 is a upgrade (free right now) to Windows 8., although it does remove Windows 8, it uses it's files for the upgrade.
So if you want Windows 10, I would back everything up you need, wipe out Vista.
Only problem is any programs you installed with VISTA, that are dependent on Windows, must be re-installed, so that would mean having the original program Cd/DVD's and serial numbers, if required.
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