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How important is your time? Pirated software, even if you could "convert" it to being "genuine", could also contain unknown/unexpected code that was added by a 3rd party. The last thing you want to do is infect your office with some spyware/malware because you were too cheap to buy legitimate operating system software. And you'll spend far more time troubleshooting issues if your software came from an unknown source like a torrent.
If you run into an issue with not being able to buy the software you need - let's say you have a legacy app that requires being run from Windows XP - you could pick up the license from a third party on ebay and just go ahead and use your pirated copy to get things up and running. How could you be breaking the law if you (eventually) buy a license?
In many cases, pirated software is hacked to run, and won't work correctly if you buy a license and attempt to apply it to the hacked version. AntiWPA doesn't make a genuine operating system out of a pirated one - it just strips out the activation code - which is a violation of the DCMA laws. In my experience, it's best to wipe the drive and reinstall fresh with a clean copy of the properly-licensed software.