So far so good. Up to Week 04 running under a Limited User Account (LUA). I couldn't find a good AV that was running properly under a LUA. That's why I couldn't run under LUA in the past. I am installed AVG 7.0 Free Edition which runs just perfect. All other AV I have tried failed Automatic Updating under LUA; required Administrative Access; doing Run As for an AV every time I logged in or rebooted was a trouble. But not anymore.
As a LU I don't have write access to WINDOWS and Program Files directories. This means no virus that's out there can't write those folders either. I feel safe for the first time running Windows. Most of us usually run Windows as an Administrator to overcome the hassle of requiring Administrative access to install Programs. If you think about it every other Operating System makes us to run the PC as a LU by default. Exceptions are Windows and Linspire.
I took running under LUA as a chlallenge. It's a good discipline I would say.