I bought a Dell Studio XPS 8100 desktop back in 2010, which had Windows 7 installed and came with a partition for Dell Factory Restore.

After having installed Windows 10, what happened to that partition? Did the installation get rid of it? If not and I were to use it to do a Dell Factory Restore, would it "reinstall" Windows 7?

Sorry if this is a duplicate of a question somewhere, I didn't see one exactly like this asking about Windows 10 upgrade and Dell's Recovery partition.
['https://superuser.com/questions/946937', 'https://superuser.com', 'https://superuser.com/users/474857/']
The recovery partition will not be touched nor upgraded during this process. If you did a factory restore, you would end up with Windows 7.
If you run into a problem where you cannot access your recovery partition, or the partition is deleted, you can run a tool called DSRFIX and it should restore the recovery partition.