Follow the basic steps in the link below to check that:
http://www.sevenforums.com/tutorials/81500-system-restore-enable-disable.html
If it's been disabled, then you don't have any restore points to use. Sorry. But if you want it enabled, do so and configure the disk space so it's sufficient to hold a number of restore points.
As to creating a new system restore point, see the link below:
http://www.sevenforums.com/tutorials/697-system-restore-point-create.html
And please be aware that a few antivirus suites such as Norton and Kaspersky can actually
"break" sys restore.. Uninstall them to see if it fixes the issue.
Hope this helps.
Grif
I decided to do a system restore yesterday as I had got in a bit of a tangle doing various adds/deletes. I normally have about 3 options for restore points but this time I only got 1 option, dated August 2014 ! How on earth could this have happened, given that I don't know how to change save/restore options for the OpSys? Pointers to the problem solution and also to handling the restore mechanism appreciated.

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