The Physical Memory sensor has detected a low level of available physical memory (RAM). Applications run faster when they are using physical rather than virtual (disk-based) memory, so a low level of available RAM can slow computer performance.
However, Windows uses much of the available RAM as a disk cache, so this sensor generally shows a relatively small amount of RAM free. Windows changes the size of the cache dynamically, freeing up RAM as needed for applications.
Because low available RAM under Windows is not usually of itself a sign of problems, consider disabling the alarm for this sensor.
The trigger level for this sensor's alarm determines what Norton System Doctor considers a "low" level of memory. To change the trigger level, click Change Alarm Settings.
