A family of Microsoft relational database management systems designed for ease of use.
I built a brand-spanking-new machine about 6 months ago (new mb, memory, hard drives, cpu, etc). Installed Windows 10, updated, etc etc, and then installed Office 2013. Had all sorts of troubles the first time I opened Excel and Access, and finally (after about 4 hours of beating my head against the wall) concluded that my fresh install of Office 2013 wasn't so fresh anymore. I manually uninstalled and reinstalled and my troubles went away.
The moral of my story - don't assume your install is good simply because it's fresh. A 2 hour install time would indicate something is wrong, or that additional items were installed (which could also be corrupt).