Windows registry error

The tune up box has the exclamation point on it.

Message I get: The windows registry could be cleaned by deleting broken entries.

I click on fix now. The registry clean up screen comes up and norton begins to do this.

The clean up then ceases and I get an error. 

I click on view details and it says: Insufficient disk space to take system restore point.

Another fix now screen pops up and norton says it is fixing tune up.

I have a lot of disk space left. Can someone help me with this?