Server not found - approx one in three times

For about the last five weeks I have been encountering many delays in getting to web pages and when I do download files they are taking an inordinate amount of time to go through the "download and then open process". 
The server not found issue seems to occur on about one page in three.  When it has failed (after about 15 seconds) I usually have to try again twice more before it loads.  Clearly there isn't an address problem or it would never load.  I have been through the Helpdesk route and they cannot find a fault.  I have tried lots and seemed to make the most progress in eradicating the problem when I uninstalled NetProtect Plus and reinstalled it.  I then had no problem for about three days and after that the fault just seemed to worsen - back to its original state.
As I said.  No problem at all until a few weeks ago.  Problem temp disappears after uninstalling and reinstalling NetProtect Plus.
Any (good) ideas please?  Getting seriously annoyed.
M

I've experienced a very similar, if not the same problem. I am running Windows XP and the problem seems to have started to happen on upgrading to IE8. When I close down the computer indicates that something to do with MacAfee (i.e. NetProtect) is 'not responding'. I don't know if this is linked to the problem or not but indicates to me that I have a software conflict somewhere! Can anyone help? Should I revert to IE7? Thks

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