Welcome to the Cyberlink Forum. Thank you for posting your dxdiag file. I am afraid that I have to inform you that you will not have much joy video editing on your laptop. Here is the link to PD11 Deluxe requirements, which is the least demanding on your computer, but also doesn't have all of the features of the higher end PD video packages:
http://www.cyberlink.com/products/powerdirector-deluxe/specs_en_CA.html
You are running Vista, which has been reported not to play nicely with PD11 and other PD versions. You have only 2 GB of RAM and a minimal CPU. You have no dedicated video RAM and a video driver that is over four years old. Your free hard disk space on C:\ is limited, though you should be fine if you are editing SD footage.
I suspect is what has happened is that as your project "grew", it exceeded what your computer resources could handle and so now it can no longer load the larger project file. Some folks here with marginal computers do their projects in small pieces, render each piece, and then assemble the rendered pieces into a final project and produce or burn that. That will lessen the strain on your computer. You should enable shadow files, if you have not already done so, and allow them the time to generate.
Personally, if I were you and were going to get into serious video editing, I would replace that computer with one that has the horsepower to handle video editing, which is the most resource-intensive thing that you can ask a computer to do.
Just my two cents. Hope this helps and have a great day.
Regards,
-Phil
Windows 10 Pro x64
Dell XPS 8930
Intel CoreT i7 (4.6 GHz)
32 GB DDR4-2666 RAM
1 TB PCIe -x4 SSD
NVIDIA GeForce RTX 2060
PD14 Ultimate x64, 4207
CD4 Ultra and AD6 Ultra
Bleeping Computer Malware Response Instructor