Question 5 - You only have 2GB available because the other 6GB are in use by Windows/applications. You may have more available but sometimes Windows temporarily allocates more than it needs to when your RAM isn’t being fully utilized. Opening other programs will redistribute the memory, so you may actually have more than 2GB available prior actually maxing out and using your page/swap file on your drive(s).
Question 5 - You only have 2GB available because the other 6GB are in use by Windows/applications. You may have more available but sometimes Windows temporarily allocates more than it needs to when your RAM isn’t being fully utilized. Opening other programs will redistribute the memory, so you may actually have more than 2GB available prior actually maxing out and using your page/swap file on your drive(s).