I am having trouble with my resources disappearing suddenly while running IE6.

On startup I only have Mcafee Viruscan and Firewall, the internet connection
icon, the volume control and Resource meter running in my systray. I have
used adware SE Personal 1.5 tools to disable just about everthing which I
think I can safely, from startup. I have used Spybot and Adware (neither run
as resident) to remove various objects/unnecessary programs and have carried
out a complete system viruscan and defrag without any problems.
Before i connect to the internet I have around 70% free resources which goes
down to about 59% after connecting (broadband)and opening IE6.
Everything seems ok for about and hour but then things start to seize up and
I get a warning that I am low on resources and they have usually gone down to
about 7% (even 1% on one occasion) and I have to close down to get back to
normal or if I'm not quick enough my system hangs completely.
I suspect that IE6 may be bugged but I do not know what to do that I haven't
already tried. I have the Google toolbar installed which says it has blocked
689 popups so far
Any help would be greatly appreciated.
Thanks
Keith