Moving Contents of Library Folder to new computer?

What about if my old Sims 3 file was messed up. My game kept freezeing and wouldn’t come undone after a few minutes of playing so I just took it that fold and created a new by loading the launcher. I have family and builds in my game that I want to keep but I do t want the error to come back. So how would I be able to transfer everything back without causing the error. Has anyone else had this problem because this was the first time I ever had my game freezing like this.