I'm not sure on the why on only one restore point.
Glad you have it back where you want.
Go ahead and manually make a new restore point now that it is working right.
I'll see what I can find on why it isn't making new ones automatically.
Check this. Only Windows 7 partition should be on. All others partitions OFF. You only make System Restore points of the OS partition.
You want system protection turned "ON".
It probably is set right but make sure. System Protection - Turn On or Off
Then you can check and make sure everything is checked or unchecked properly here also. System Restore Point - Create
If you want to make sure on actual space alloted. Which I think you may have alreeady done. Just making sure. System Protection - Change Disk Space Usage
I hope something there helps.