I have installed window 7 rc x64 on my PC (AMD X2 5200+,4GB RAM,Board asus M3A78-cm) everything is ok but when Im starts a program or installer (install a game or burn a DVD) the physical memory begins to grows very quick, in 3 minutes the memory is around 3.5 GB of 4.0 Gb and im close all programs but the memory dont down and stucks in over 3 gb, Im dont know what is happend.

Go to the Processes tab in Task Manager, click on "Show processes from all users", then double click on the CPU column, and leave it running in your Task Bar When the system starts to eat the memory, restore the Task Manager and see what processes are eating up the most memory. Also let us know what you were installing.- John