I love W7 and have installed it on a bunch of machines. Can be a little tricky to keep Microsoft from trying to upgrade it to Windows 10 though. W7 will be supported with security updates for a few more years, April 2020 I think. I use Avast for AV and ZoneAlarm for firewall, both free and good. For a while I was buying W7 for refurbished COA's (license) on eBay, don't see those anymore these days. Looks like you can still buy a W7 DVD and a COA for about 30 bucks though.