Your pilot profile stays as well as your settings…I have meanwhile 4 times re-installed MSFS, thus can claim this. I do not think that you can move the whole installation from on PC to another one, which is quite annoying. I do not why we can not own the files, like in XP11 for example. My XP11 has over 400 gb (with add ons) and I do not need to download the whole “thing” over and over again. And if important files get corrupted, the XP installer will find and repair them. However to make the long story short, you need a new clean install on the new PC I guess.