I am posting in the event that others are having the same problem.
For about the last two months I have experienced a very slow start up with any of my browsers. I would frequently get a message that the browser was not responding.
I followed all the advice on malware, viruses etc. but nothing helped.
The other day I happened to open task manager and noticed that a very high cpu and memory usage. As I scrolled through task manager I discovered that all of my McAfee programs (Shaw Secure) were using very high levels of resources, constantly.
So I uninstalled All of the McAfee products and reinstalled them and all of my problems disappeared.
Just another option to look at when having internet problems.