If I add a bigger hard drive do I have to add more RAM??

Hi KFT5 and welcome to D-A-L

no not realy, just adding a bigger hard drive mean you'll be able to store more data.
the more RAM you have the the quicker some programmes may run as you're not using the hard drive as virtual RAM

Brain_Damage is, as always, exactly right. But, if you want a little more detail, we've written a short article on this topic in the Computer Help Articles section of the forum: http://www.d-a-l.com/articles/library/7.html

MODERATOR IS THE MAN, Cheers