Clean out everything you're not using ! Go to your control panel to add/remove programs and delete the ones you don't need . Then go to "My Computer " and look for files that are not being used and dump them ! Run a disc de-frag and your anti-virus ! Then download CCleaner free and use it to clean up the registry and all other junk . Make sure your Internet files are cleaned out also ! These are generally things that make it run slower ! Cleaning time !
Computers come out of the box pre-loaded with all sorts of useless tools and demos that the makers pay to get pre-installed. Your computer needs to be "optimized", which means removing all the crap you don't want or need. You don't sound like a geek, so I'd recommend taking your computer to BestBuy or your local computer repair shop and asking them to optimize your computer.