rrr99999 :
so that means....I can install it without problem?....only the security?.....Cause if I have anti virus program,I don't think there will be trouble,cause Im using xp on another machine and no problem.
I don't know rest of your hardware.
1st - you will have to integrate USB drivers into installation.
If you want to install on NVME drive, then also several hotfixes and additional NVME drivers will have to be integrated into installation.
Also - you'll have trouble updating windows, because windows update will be broken initially.
And if you manage to fix it (bunch of hotfixes have to be installed manually or integrated into installation) after that you'll get the "Unsupported hardware" nag screen.
If you think all of that is worth it, then go ahead and install windows 7.
With windows 10 everything is much simpler.
BTW - antivirus will not help you against unpatched OS vulnerabilities and exploits.