If you're installing Linux on the old computer with Windows (for yourself to use) there's no reason to wipe the drive... just let the Linux installer use the entire drive, which effectively erases everything (but not securely). Some old left-over Windows virus cannot cross-contaminate your Linux box, it's just not how things work.
(this is ignoring the almost purely academic possibility of cross-platform viruses stored somewhere like the drive firmware/usb device firmware, but no wiping or virus scanning would find such a thing at this time anyhow, and they're more theory than actual fact -- except for reports that the NSA has such a thing)
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