Okay-I''m back.
FF fubar-ed it's download or installation, so I'm not doing the update.
Seriously-those programs I listed WORK WONDERS, and they're all free. They all scan and/or protect in different ways, so no conflicts.
Also, try out
www.pcpitstop.com.
My 'puter dude turned me on to it, and it's a legit computer scan site-no spyware or viruses.
They analysis your computer and even compare it to others of the same type to show where your system ranks, and tell you fixes for your system.