saving issue

Hi everyone, 

I am unable to save my layout on RTR and i am unsure why... 

I have extra models installed, they all work and expansion packs etc. There is space on my hard drive also but everytime i try to save i get a message that says save unsucessful. The auto save message appears and says it was succesful but cannot find the auto save file in my RTR folder

I know the obvious soloution is to reinstal but im trying to find out if there is another way? 

Thanks