Need help finding the right video production software I have the following situation:
- I need to create a movie in the format .mov or .mp4 on Windows 8.
- As sources I have already 10 .mov files in a format 1600x1200 on Windows8. (originals)
- I need to speed up some parts of my video up to 30 from the original.
- I need to export the constructed video again as 1600 x 1200 in .mov or .mp4 with the same quality as the originals.

I tried to do this already with my tools I already have, but I did not succeed:
My Software:
- Microsoft movie maker
- Handbrake
- Movie Studio Platinum 13.0
- Windows8

I like the simple MovieMaker, but it cannot handle/produce 1600*1200.
Also Movie Studio Platinum 13.0 can't produce 1600*1200 and I am not able to speed up the video more then 4x.

Any hints ?

UPDATE

My Speeduf problem is solved, but I am still searching for a performant reliable software to create videos in the format 1600*1200.
I have Movie Studio Platinum 13.0 which is unusable. It produces black screens in some parts of the video and it lags. I have a high performant computer with 24GB of ram.

Can someone suggest any software ?
You could use Davinci Resolve. The free version can do all the things you want.
It's a professional software tho, so you'll maybe need to read into it.
But you can allways ask here, we can guide you further if you're stuck.