inspectit,
Thank you for visiting the OneCare program forum.
OneCare will first run the tune-up with the previous time and date before running it on the rescheduled time and date.
You can set the tune-up to run at a scheduled time and date.
Please make sure that your time and date on the system is current.
Please contact Support if this issue is persistant:
How to reach support (FAQ) - http://forums.microsoft.com/WindowsOneCare/ShowPost.aspx?PostID=2421771&SiteID=2
I hope this helps,
Lori MS