|Lack of MS updates will eventually lower your security, so all XP users should either set themselves up as a limited user or use "Drop My Rights" (free - Microsoft employee). In fact they should have been doing one or other of these for ages.|
I find running as a limited user a real pain, so favor Drop My Rights. It's a very tiny program and you just make a special (two stage) shortcut to your browser. You hardly know it is there, but for the odd specific situation just keep your normal shortcut around too. See here:
Another thing to do is have SpywareBlaster on you computer because this also uses no resources and blocks you from many "nasties".
Consider an alternative browser such as Firefox because that will probably be security updated for XP well after MS stop updating Internet Explorer 8.
I have Windows Vista and 7 in the house but still prefer XP as my workhorse. I will stick with it until either the software or hardware becomes so dated that it won't do something that I want. This has not happened yet and it might well be years away.
Always pop back and let us know the outcome - thanks