Oh I am so sorry to hear that! My sincere condolences to you and your friend for his loss.
As for your laptop, it looks like it came out circa 2009, and the video driver you have installed (which appears to be the final version) was released in 2013. Overall, I think you're lucky that PD18 will run at all on your system, but I think it's also why you've had so much trouble.
In all honesty, any used laptop or desktop that's only a few years old will run circles around this laptop, and any newer system would be a far better choice for video editing.
In the meantime, I'm happy to produce a full quality version of your video and send it back to you. You'll just need to use Pack Project Materials under the File menu and upload the contents to Google Drive, OneDrive, DropBox, etc.
Please send me a private message if you're interested, and I can give you an upload link if needed.
Wishing you peace
YouTube/optodata
DS365 | Win11 Pro | Ryzen 9 3950X | RTX 4070 Ti | 32GB RAM | 10TB SSDs | 5K+4K HDR monitors
Canon Vixia GX10 (4K 60p) | HF G30 (HD 60p) | Yi Action+ 4K | 360Fly 4K 360°