How to grant "log on as batch job" in Windows 7 Home Premium

I just spent an hour trying to figure out this one so I thought I'd share the wisdom...

If you have been trying to schedule a task and run it as a regular user in Windows 7 you will probably have come across this...

This is due to a basic security measure implemented in all recent versions of Windows which requires users that run scheduled tasks to have a special security right. (A similar security measure is also used in the services system but when you change the user in  the services manager it automatically grants the user the right and tells you its done so.)

(Updated: 9:13, Fri 9th Jul 2010)
Posted by Daniel: 11:14, Mon 1st Mar 2010