In your listing, Kevin, it shows 'user' under the 'type' column. It is there it is USUALY (no such thing as standard in the IT world!) changed.

In the setup screen you would highlight that field and, normaly, press the enter key (or something else - see note above about standards...) which then gives a list of what you can set. One of them should be 'auto'. Select this and press enter again. All the 'size, cyls, heads' etc. info will then be blanked out. Save and exit and Bob's your Uncle. Or Aunty depending on whether your BIOS is gender specific...

WARNING. Messing with other BIOS settings could screw your computer (technical term). If unsure take it to wherever you got it from.

Cheers

:D