An age old problem...my pc is running slow?

I have done all the recommended checks - anti-virus, spy ware etc, i have used cleanup and crap remover, taken off programs not used often...everything I can think off but it is still SLOW!!! Other than adding extra memory (which I am looking into) is there anything else that can be suggested? Its really annoying.... show more I have done all the recommended checks - anti-virus, spy ware etc, i have used cleanup and crap remover, taken off programs not used often...everything I can think off but it is still SLOW!!! Other than adding extra memory (which I am looking into) is there anything else that can be suggested? Its really annoying.
I am toying with taking it to somewhere like PC World and asking them to look at it and sort it but that is a last resort.
Its not old...only had it 2 years, and all it is really used for is MSN, Face book and photos and there aren't many of them.
Any useful advise would be most welcome. Thanks........
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