If you have enough drive space, installing a dual boot system is no more trouble than overwriting the windows system. And, again, IF YOU HAVE ENOUGH DRIVE SPACE, there is NO downside. You may derive no benefit from it, but it can not hurt. You don't HAVE to use it. It's not going to magically attract malware while it is sitting inert on the drive. You will not get more bragging rights by ditching it. It won't even control the boot process anymore. It leaves you an option you may never use. So what? Think of it as a long shot bet that costs nothing to cover. But if you need the space, that's a different matter. In that case, back it up and ditch it. That is if you need the space NOW. If you are just thinking you might need the space at some future time, that's irrelevant. When that happens, just reformat the Windows partition. Also, there is much to be said for having 2 or more bootable systems on a machine, regardless of what kind of systems they are. If you bork one you might can fix it from the other.