The Earthlink items, if you are not using them, I would give them a punt. Also, and I am assuming that you have not done so, go thru the Add / remove programs list and uninstall anything you are absolutely sure you are not using. If you don't know what it is, or if you use it go ahead and ask. This is the drawback to buying systems that are preconfigured. They come with a boatload of software that will never get used.
As for the lockup, it is very possible that there was no real cause. It happens to everyone occasionally, just as everyone occasionally gets a BSOD. As long as it only happens a couple times a year, there is no need to worry about it. If it happens every day, there is something wrong.
How has the computer been running?