Right-click "My Computer", "Properties", "Advanced" tab. Under
Performance section, click the "Settings" button, "Advanced" tab,
under the Virtual memory section, click the "Change" button, and
check the option, "System managed size". Click the "Set" button,
click "OK", "Apply", and "OK" your way out.
That message may appear if you are running out of hard disk space. ie
windows needs a place to put its virtural memory file on, commonly
called the swap or page file.