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#41
As long as you are absolutely sure they are virus free and they are legit, yes. I know about Humble Bundle. They are OK. I suspect most of your viruses and computer problems came from the cracked software. I wouldn't advise ever putting it back on my machine. You will have a lot of people say I am crazy and they do it all the time. You have seen the evidence yourself. But, before putting anything back on the machine including your other hard drives, be certain they have no viruses and Trojans in them.
Also be careful about viruses on anything like your USB Flash drives too. Anything can be infected. Just be sure they are not before putting them back on your clean machine.
As soon as you have finished the install I would use a program like Macrium and make a system image and put it on an external hard drive or somewhere safe. You can use it to restore the system to that point. You will never have to do another clean install again. Just restore that image. many people do regular images so if something were to happen, they could restore the image and not lose a lot of time and effort. You can even make an image of your game files.