Why is it NOT NEEDED with specifically JUST XP?

You don’t think Windows Defender (WD) is worth having as a second layer of malware protection?

So the “real time protections” for WD takes up a lot of RAM?

Task Manager shows WD (MsMpEng.exe) using 388 Kilobytes to 1.5 megabytes. By comparison Avast (AvastSvc.exe) is generally running in a range of about 20 to 45 times that using approx between 8-17 Megabytes.

Or are you saying the “real-time scan” takes a lot of CPU usage? Unnecessary duplication with Avast?

I’ll try ANYTHING to avoid the system slowing down to a crawl (generally locking up) whenever AVAST IS DOING VIRUS DATABASE UPDATES!!.

If you really think it’s that much of a resource hog (I have no idea) then it would still seem to be a good backup scan device for malware (just don’t use the real-time protection and instead manually update the database and manually scan). Am I wrong here?