for best performance in the PC :
1) right click on "my computer"
2)properties
3)advanced
4)Performance : click on Settings
5)Visuel effects ( first tab) choose : adjust for best performance
6)Advanced ( middle tab ) : choose Programs for both Processor Scheduling and Memory Usage
7) Virutal memory => change => only choose the drive C for Virtual Memory
and make it custom size :
initial = 1.5 x (size of your RAM )
Maximum = 2 x ( size of your RAM )
never let the windows manage the size .
enter OK for all , the system needs to restart , and enjoy the new speed