Don't know how to reinstall or "back install" - Please help

10.6.7 has created several problems for me and I'm pretty sure I need to revert back to an older OS. I may try 10.6.3 which is my boxed set version or I may need to go all the way back to 10.4.11 to get a third-party app to run correctly. In either case, can I simply install the old system over the version I am currently running or do I need to start up from the install disk, wipe my drive clean and then install the older system? Thanks for the help!

Sure, and thanks for the reply. The computer in question is an older, 17" Intel iMac and it is used almost exclusively for presentations with a projector. I use a third-party presentation software program regularly. I was running 10.4.11 for some time with no problems at all. On a whim, I decided to upgrade my OS. I purchased the box set (10.6.3) and installed it. Then I immediately ran software update and moved on up to 10.6.7. The problems begin at that point. I concluded that the presentation software was not compatible with 10.6.7. No "fix" is planned by the presentation software company so it looks like I must do a clean install. I never had a chance to run Time Machine after the install. I thought I would revert back to 10.4.11 since I know the program ran well when using that OS. If you can think of a better approach, I'm surely open to it!

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