For my old grossly underpowered Vistax32-SP2 computer I have been using whatever has been Webroot's flagship offering at the time. Currently it's named Webroot SecureAnywhere Internet Security Complete. It seems to detect problems as well as any other anti-malware that I've used, and it does that with a super tiny footprint on the machine's resources. I also have Windows Defender enabled, and run the free version of Malwarebytes every week.
- Compaq Presario SR5210NX
- Intel Celeron Single Core 420 1.6GHz