[CentOS] YUM and RPM often freezes my computer

>
>Cleans packages and headers downloaded ... the headers will be
>downloaded again the next time you run yum update
>
Thank you. I hope that will help alleviate the problem.

One further question, though. Is this situation regulated to just YUM, 
or is it possible that I have other programs or processes filling up var 
or otherwise consuming hard drive space? Is there some sort of general 
cleaning I should be doing with Linux to keep my hard drive from filling 
with unecessary data?

Dave