My favorite thing as a Windows user who (shocker!) actually keeps my admin account separate from my user account, is when I have to sign in as admin to install something and then... all the data/env/shortcuts get set up for the Admin user instead of my user account. Many Windows installers break in various ways when you're applying the most basic security practice of only signing in as Admin when needed, and not constantly rolling around in an admin account.
Fun story time. I had a manager who used to work for Microsoft. Apparently he had to talk to a bunch of people before he could get Office to install properly when not running as Admin. This is pre-Vista release but it shows that even Microsoft didn't always write their software in way that was the best for their own OS.
