I figured out why PP CS4 is unstable at start-up. I thought it had stopped doing this but in my Stero Effects folder are about 7 music VSTs listed. PP will start up sometimes and shut down at other times . It's about 50-50. So, I was reading about a way to block VSTs from loading using the "black list text". It wasn't very clear to me. Is there a tutorial somewhere on how to go about this?
I couldn't get the "blacklist.txt" thing to work so I just move the offending VSTs to a folder on my desktop while I'm in PP.