Right click on "Computer" choose Properties and in "Advanced System Settings" choose "Advanced" tab, under performance click on settings and then again on "Advanced" tab. Under "Virtual Memory" there is a "change" button, click on it, choose the "System Drive" and under that you will see custom size radio button, select it, uncheck the "Automatically manage page size" and set the desired virtual memory. In initial size I usually set the Recommended (its in the bottom of the window) and for Maximum size I set 50% more of the recommended. After setting all this first hit "Set" button and then OK. This allows the software to use some of the hard drives as RAM memory in case the RAM gets full.