I did this for my lenovo (downloaded the copy of windows from MS), and I'm really happy with the results. I was dealing with some instability issues, but that was mostly self inflicted. I was tempted to download the restore image from lenovo but something about starting off clean and only installing what I wanted drew me in.
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I run the utility suite on my servers and there's a lot handy little utilities.
Windows Defender is good enough unless you visit porn or crack site's.
I run hot and cold, even my company relies solely on Windows Defender and I'm not knocking it, yet I'm trying out BitDefender and I'm pretty happy with what it has to offer. I live a very boring life, so hacking/cracking sites are off the table as is porn so I'm the type of user that would be fine with windows defender. I haven't fully decided on sticking with BitDefender but so far I'm satisfied.
It also includes a VPN, but I've not used it, and I've not check in on how good/bad/indifferent this vpn is. I've done zero research on that aspect, I suspect though since its bundled with antivirus, its a basic VPN that is only marginal.