[mothered]

Try Windows 7. Browsers and antivirus will work with Windows 7.

If you'd like to strip/customize the OS to your needs, this tool does the job with ease.

[Jacob Harlon]

Linux uses less than Windows. Linux also has a smaller footprint than Windows, and it offers a plethora of desktop environments including several that are very lightweight.

[Trafford3Devil]

If you have to use Windows, I'd recommend Windows LTSC 2021 IoT. It's Windows stripped down to be used for kiosks etc.

[ICallShotgun]

Linux will not make your personal computer magically work longer, however, it has a more diminutive memory and CPU footprint than Windows, leaving more of your resources for your programs.

[Anywhere4402]

The best are Manjaro xfce edition and xubuntu

[seomarket]

you can go with windows 7

[puceniza]

Windows XP is very nice soft nowadays

[rickmother]

i believe it's puppy linux it's too small or you can look for old linux versions of lubuntu or someting like that