Several days ago I managed to increased the size of the virtual machine by following the instructions I found in this forum. But I realized that I did expand too much(80G) because of my poor knowledge of the compputer thing... It probably slows down the speed of my Mac, so I wish to decrease the size of the virtual machine without reinstall the whole Parallels system. Is there any possibility?
it will only slow down if you allocate too much ram under 500mb out of 2 gb seems to be best try and clone your present machine and experiment with the clone best to use the defaults unless you have reason to change them save all your work to the Network / shared folders so you may access it from either OS Hugh W
Don't worry, it will be OK unless you will really use all of these 80GB inside your VM - aspecially if you don't have this space in your primary system