when I open a project to continue working on it, it can't locate the powerpoint slides I had arranged on the timeline, when I seek to reload them, I have problems
We'll need some more information.
What version of the program are you using and on what operating system?
Where on your hard drive are your Powerpoint slides located?
You say "when I seek to reload them, I have problems". Please describe exactly what you're doing and what you're seeing when you do it. the more specific you can be about what you're seeing, the more likely we can help you.