The original recommendations of using a standard account day to day in the first post is something I've been drumming into professional IT Admins for years and should be standard fare in any IT Pro Shop.
Yet I still find IT Admins logging on to their desktops with privileged accounts and on to privileged systems directly. Arghhh!
For my own music laptop - I operate a use at my own risk policy. I use an Admin account and Security Essentials for AV.
My use at my own risk policy is if I need wipe and load then this should not involve data loss. Therefore I'm careful what sites I connect to (manufacturers only) if I need something else I do it on another machine. I also have an MDT (Microsoft Deployment Toolkit) server (VM) that contains my image with my base OS and apps. To wipe and load - I just PXE boot the laptop and back it all comes (drivers as needed). Of course there's tuning and tweaking afterwards but it saves me time.
Also if it's not backed up - I obviously don't care enough about it....
As long as you accept your risk of data loss then don't be surprised/upset when it happens - because it will.