Hi Paul
Run as Administrator is an option when you right click on various programs. For example on my PC using Access 365:
Most of the time it isn't needed in Access. However, it provides elevated permissions to do things using VBA like editing the HKLM hive of the registry, change the system date/time etc.
Try running the ChangeClockDate or ChangeClockTime procedures (or do both together using ChangeSystemClockDateTime) using the updated file I've attached here.
First of all try to do so with Access opened normally. You will get error 70 - permission denied.
Repeat with Access using Run As Administrator. Those procedures will then work. Use ResetSystemClockDateTime to reverse the changes
UPDATE
The Access 2007 shortcut does NOT include the Run As Administrator option by default but this can be overcome.
See
How do I run Access as an Administrator? - TechRepublic