Setting restore point weekly using Task Scheduler is not setting RP.

I have Task scheduler set for a once a week Restore point.
It tells me it has done it, but there is no record in the System Restore
window.
In fact, it is not doing any automatic set RP, at all. Surely things like
installing new software should trigger one.
I have to set RP's manually.
Any thoughts ?
Moray.