Computer Help and Support

And networking them - copying all the old stuff to the new computer.

If you haven't already done so, now, before you have too much stuff on it, is a good time to partition your C drive into two drives. C: for Windows and programs, D: or whatever for your own personal stuff. This makes is easy for future migrations. You can do this via Computer Management/Disk Management.

I'd also be installing a copy handler - Tera Copy to monitor and check that copying the files is not fouling up. It's invaluable.

IMO, you are best to start afresh with your Windows, registry, programs etc. Old wine into new skins and all that. (I think that should be new wine into old skins....)

Use the networking wizard, it's not hard. Just make sure that first you Share all the folders on your old machine that you need to copy. You could copy over your Firefox user profile or export bookmarks as a json file. There is also a neat little tool called MozBackup which makes it pretty easy. Make sure you "Show Hidden Objects" in Explorer - you need this to see where your Mozilla profile is stored.

PM me if you need any help.
Edit to add Mozbackup link: https://mozbackup.en.lo4d.com/windows