There is a great video/tutorial on YouTube by Britec which shows the many workarounds necessary to schedule backups with ERUNT and Win 7 x64.
I am only an average user and thoroughly did my homework before using ERUNT.
One needs to work with a scheduler, tic a few boxes like running with highest priveleges etc.
You may be right but my research shows more needs to be done than running as administartor.
Perhaps right clicking to run as admin may allow a one time backup I do not know but to schedule backups requires more I think.
I am going to see if I can find that video. http://youtu.be/h26tfWJSvPg
I hope that works.