I gave up on that eminently laudable attitude, and run the PC with me as Admin. I know the risks, and choose to take them. It's not been a problem so far, and all the stuff I want to run does so when the Task Scheduler says it should...
Bit like running the iPhone jailbroken - I know the problems that might bring, but I need it to run (proper original) WiFiFoFum and Mr Apple decided a few years ago to stop allowing me to do so. I don't have any of that rooting compound installed, and nobody else gets to install stuff, so I reckon it's my choice to accept the riskette.
Interestingly, Apple got someone to produce a "new" WiFiFoFum which does something completely different (and useless to me).