Hi Donna,
I wouldn't worry about it. I've done dozens of these upgrades.
If a computer runs W7, it will almost certainly run W10--I haven't seen a problem yet.
The upgrade to W10 will give you a message that it's spending a few minutes checking things.
It quits if there are problems with the W7 install itself that prevent upgrading to W10,.
If there are problems during the W10 upgrade, it rolls back and quits.
(Those problems are usually fixed by doing a similar in-place W7 (not W10) repair install.)
The W7 operating system is saved as C:\windows.old, and you can go back to it.
The upgrade to W10 works remarkably smoothly, in contrast to the endless wretched Windows updates and their failures.
Cheers,
Carl Fogel
