Dllhost.exe*32 and svchost.exe

My computer is running very slow. Web pages take a long time to load, and often get a ooops, can't load this page error. CPU high risk  window keeps popping up. Norton window keeps popping up saying it is blocking several malicious websites. Task manager has multiple dllhost.exe*32 and svchost.exe programs running.

I am running Norton security suite and malwarebytes anti malware. I have done numerous scans with both, and several Norton power eraser scans, even in safe mode with internet. Everything comes up "no threats detected", but the computer is still running slow.

If I do a file cleanup in through Norton, it deletes anywhere from 30,000 to over 200,000 temporary windows files, every time.

I even signed in to Norton and gave control over to their tech, who ran a Norton power eraser, said the computer was virus free and logged off, only to have the problem still happening.

HELP !!