Have they tried running disk utility? Its in the applications/utilities folder
You could also try OnyX, make sure you get the right one for the version of OS X you have. Let it run its checks when it starts, then go to the automation tab and check all the box similar to what is shown in the link below. Then go watch a movie, it can take a long time to run all of those. http://www.titanium.free.fr/pgs2/english/onyx_leopard.html
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the-goth-pixie.livejournal.com at 12:18am on 06/06/2009![[personal profile]](https://www.dreamwidth.org/img/silk/identity/user.png){kind=small}
You could also try OnyX, make sure you get the right one for the version of OS X you have. Let it run its checks when it starts, then go to the automation tab and check all the box similar to what is shown in the link below. Then go watch a movie, it can take a long time to run all of those.
http://www.titanium.free.fr/pgs2/english/onyx_leopard.html