I have been having loads of problems of late with my Internet connection suddenly going very slow and intermittently hanging. I've since reviewed my security and think I may have had too many programs. Before I had:
Have you checked that the air vents are clear of dust and fluff if so inside will also need cleaning. Maybe give C Cleaner a run. Are you using the latest version of Zone Alarm. Have you run a defrag recently.If not i would run one.
Have you got enough disc space left and enough memory.
If using Internet Explorer maybe try IE7Pro add-on. Make sure ad-blocker is ticked and mini Download manager is unticked. click here It will help you browse a bit quicker.
You could always download Malwarebytes free and just run it once a month it is one of my favotites
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