Nuking an extra Windows install from orbit

... because it's the only way to be sure.

Okay, so, some time back, I was having issues with a failing hard drive. While testing to verify that, I ended up installing a copy of Windows Vista on my Steam drive and making sure the computer could boot from there (it could).

I have since upgraded to a completely separate computer running Windows 8, but brought along my Steam drive because of course I did.

The problem is that there's still ~14 GB of Windows Vista and associated programs on that drive, and I'd like to free up the space. I've tried just manually deleting the files, but I get a "You need permission to perform this action. You require permission from TrustedInstaller to make changes to this file," warning, and cannot proceed from there. Most everything I've found has recommended formatting the partition with the second OS, which is pretty much a nonstarter.

Any ideas?


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