You, some installer or tweak/cleaning utility turned of System Restore or stopped the System Restore Service temporarily.

- You or some tweak/cleaning utility run the Cleanup agent in "advanced mode" with the setting to delete old restore points.

- You or some tweak changed the maximum restore point age to a very low value (default is 90 days).

- You ran out of disk space at some point. If your disk space is too low restore points are going to be deleted automatically.

Unlikely but still possible are other problems including incorrect system date, not fully compatible Antivirus or Firewall software.

As for troubleshooting I would manually cleanup all restore points at first (using the Windows Cleanup agent, within the advanced setting) and then just set the Disk Space for system Restore to 50% or more. As previously mentioned you don't have to worry about running out of Disk Space since older restore points will be deleted automatically if space is required

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