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Thanks for all the answers, I will try and cover them all in one go.
First, I cant load SP3,T tried again today. Firefox absurd frequent updates,
create problems, just google today the version 36 as suggested and there are pages of complaints about it . In safe mode I have used ccleaner, Defrag. and scanned with MBAM,Avast and SAS. No strange usage showing on T.M. Because of finances and I am 84 'buy a new computer' is not helpful advice , I was asking about confliction in the programmes. Last point, the main delay is when the bottom tray loads, this is all of 2½ minutes.Having researched a lighter Firewall I intend to uninstall Private Firewall and try Ashampoo 1.2 I found today that this is light and designed for XP Thanks