Not sure about manufacturer's own partition and the ability to create factory reset DVDs. You will have to look at 'all apps' (similar to all programs) for info. Dell might have an app for Recovery Manager or similar. Other manufacturers the same or they will just depend on 8 for creating a recovery media, which, in my opinion, is a cop out if true.
Once you get to the Start page, have a look at the Apps, then right click a blank space and in the lower bar that opens, select all apps. The new window shows 'all programs' in app boxes. Any trials there, then right click the app and select uninstall in the lower bar that opens. Just check that you don't need them. If Norton there then uninstall as you will install a newer version anyway.
Don't listen to Jock1e as he's set in his ways :) Sorry Jock1e !!
bturner , bet your mum will take to Win 8 easier than you will.. lol.