Go Back doesn't go back very far?

I should have made my user name 'stupid question guy', but here goes. 

 

I have Go Back as part of System Works 2006 on a Win Xp machine.  Whenever I try to use Go Back, I only have available restore points that go back a maximum of a few days.  Unfortunately my wife will do 'unknown' things to the computer and not tell me.

 

Is there a way to increase this range? 

 

Also, is it true that System Restore won't work with Go Back active?