I have seen your posts (#8 and #9), but I had to go somewhere earlier and couldn't reply immediately. I'll reply to your paragraphs sequentially. (Caution, long reply ahead. Proceed to end of post for a one-sentence, one-line summary. :smile
Since you have a Windows 7 license/product key, then it looks like you can only do a "legit" install of Windows 7 - which you can later upgrade to a legit Windows 10.
That's great then - as long as that's the case and nothing weird is going on with your computer, your PC should be fine.
There's enough reason to be concerned (believe me, I understand what you feel - I "used to be" an "anti-virus freak", updating my anti-virus almost hourly and scanning my PC almost every day at one point in time :wink
. I even used to insert my flash drives in virus-infected computer shop PCs to intentionally infect the drive with viruses and then insert that drive into my PC - just to check if my anti-virus is working or not.
I'm not sure if you're referring to "Auto Play" or "Auto Run". From my understanding, "Auto Play" is a course of action the PC "takes" whenever a storage media is connected to it, e.g. it could either launch a particular app/software (explorer to view contents, Windows Phone app for desktop if it was a phone, Windows Media player for music/videos, etc.); while "Auto Run" is an executable file that is usually found in portable storage media (such as CD installers) - this is the thing that viruses usually attach themselves to or modify so that they can be copied into or run in your PC as soon as you insert the storage media. Based on the text you've included, it looks like you're referring to "Auto Run" but that's just a deduction - it appears that the anti-virus software was able to act on them before anyone of them could be launched so it's more likely that you're referring to "Auto Play" which isn't caused by a virus.
At any rate, the scan results says 62 out of 62 threats were addressed by deleting them, so that's a good indication. Also, your follow-up scans of your PC reported that there were no threats, so that's another good indication. Lastly, there are no weird processes running in Task Manager - a third good indication.
But now, the case of being convinced by your brother is a totally different one.
Auto Play may have been automatically deployed, but it seems that none of the viral executables were deployed upon insertion, so... I'd say that your PC is clean based on the information we have right now. Then again, let's go back to post #5 for some of the things we can do to be "sure" about the virus-free/infested state of our PC. Peace of mind is a rare thing to possess nowadays, so if you have the time and luxury of not losing any of the files you currently have in your PC (i.e. if all of them is backed-up), then you may proceed with a clean install of Windows 7 and then later on upgrade to Windows 10 - keeping in mind that you most likely will encounter the same kind of virus-related detection prompt in the future, in which case you may or may not need to again decide to reinstall Windows 7 and then upgrade to Windows 10. :wink:
In summary, do whatever will give you peace, but if I may suggest: a reinstallation doesn't seem to be necessary at this point. :smile: