@ ThePinkLady
Thanks for the screenshots -it does help

.Unfortunatlely it doesn't list hidden processes.
A couple of things stand out : Explorer @ 25% CPU approx. Not really enough to cause a sluggish system ,
but somewhat curious as to what's eating that CPU
The other is Internet Explorer ( iexplore.exe) somewhat high @ 251 MB ,but again ,not in relation to available RAM.
A tool to find out what it is in Explorer that's using so much CPU , is Process Explorer
Process Explorer v12
Process Explorer
Just run it and look for explorer.exe > expand the nodes (+ signs) as necessary.
Maybe you could take a shot of that too?
As to IE - you can redcuce memory usage by having fewer tabs open or just minimize IE now and then.
The minimizing causes IE to unload some of its hold on memory.
BTW ,that works for a lot of other programs as well.
As to your use of Black Viper's reg tool - you did a good job ,but just using the default ,which is preset as you open that page, is not really effective.The idea is that you change the settings to fully take advantage of obtaining more optimal settings.
Just take your time to familiarize yourself with the first page and make notes.Then apply those to the reg tool.
I know it's confusing and unfamiliar ,but you should give yourself a fighting chance

Just reread the entries so you get more familiar with the concept.
Anyway ,let's see what Process Explorer tells you.
Pete.