My wife got that call too, we laughed and waited.
and waited.
Still waiting - still working
RE your favorites etc.
It may be best to back them up now, save them and put it in a safe online location.
Perhaps get yourself a gmail account (comes with plenty of online storage too) and save them in the cloud.
Same with your pictures, just have eveything marked as private and not public.
Although a more secure way of dealing with it would be to get another hard drive, add that to your existing machine and copy everything to that, then you can remove it and add that into a new machine when you eventually get one.
Or buy your new machine and copy the files over to it (you can take your existing hard drive and put it in the new machine to then copy the files over).
RE learning windows 10: There are add-ons that will make the desktop look and behave like windows 7, other than that - its still windows just it's gonna be a damn site faster.
Just beware of buying a 2nd hand system thats got win10 on yet is not really capable of running it well.