Probably half the world is editing with CS4 on a 32 bit system, me included and with less issues than any other version. My system is minimalistic.
It is possible your issues are not with the software. Suggest giving us some info and we might be able to help.
1. Do you have the latest update (4.2)?
2. Describe your computer, drive arrangement, video and sound card.
3. What is the source of your video?
4. And of course your problems