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Thanks for that Nigel,I have Norton security on my computer,if I download the anti virus would it override my Norton security,i will try the other 2 and hope they work ok, I have next to no knowledge about computers so sorry if it seems silly question.
I don't know much, but I do know that Norton is rubbish! Scrap it and use a free anti virus. Major Geek has lots of options to compare
AVG is very good. I also have WinPatrol which prevents anything from altering your computer without your permission. also use Spybot which stops various other nasties. They all work well together.
Norton takes over your PC. I use Avast.Also take all your programs of start up, just put them on when you want to use them. Having stuff like skype etc running in the background all contributes to it slowing down.Give it a defrag when you go out one day too.
...Windows XP is well known for slowing down over the years - Anything more than a couple of years and it becomes sticky.