From my experience with; "Free trial" of ...
Paul... 8-)...!
I agree 100%.
A very long time ago I used to download "trial" versions of software. I think that the problem is that the manufacturers make THEIR software perform better by optimizing your system for THIER software, no matter how bad it makes your system perform with other software.
On top of that, Windows uninstaller always leaves trash behind. I now use Revo Uninstaller to remove software, and CCleaner to make sure it's gone.
I used Norton back in the '90s. Sometime after it changed hands it became less effective and slowed the system down.
I next tried McAfee. I liked that until I got a virus that turned it off. McAfee then added a password requirement if you wanted to turn it off. But by then I'd moved on.
I use to swear by AVG and used it for almost 10 years. And then I started getting viruses.
For the past 3-4 years I've been using Microsoft Security Essentials. It's free, which suits me just fine. And I