Remove necessity for permission to run

Can someone please tell me how to get my incremental backups to run automatically?
A couple of months ago, I had to find out why they weren't, and to have it explained that the "credentials" password requested in schedule set-up is simply the Windows account logon password. Having created an entirely new backup and incremental scheduling with that properly input, or so I thought, I was dismayed to find that the incrementals were still not running. I have since been through the entire process twice, with the same result. The only explanation I can come up with, is that I have missed something, somewhere, that says, "Run without requiring credentials." However, I cannot find it.
I have been using Acronis for over six years, and it was only after I got W7 and Acronis 2010 that the application has caused one headache after the next. While I appreciate that Acronis is a exceptionally complex tool (as proven by the instruction manual), I can't understand why such a leading company marketing to the average home user would not have resolved such basic issues prior to release.