Active Directory Domain Services was unable to allocate sufficient memory to process an incoming request. This error has ...

Active Directory Domain Services was unable to allocate sufficient memory to process an incoming request. This error has occurred the following number of times in the following time period. 
 
Number of times occurred:
%1 
Time period (minutes):
%2 
 
If this event continues to occur, a low memory condition on this directory service exists. 
 
User Action 
Increase the amount of available physical memory, pagefile size, or virtual address space on this computer.