Loosing Memory

Additionally - check you have sufficient free space on the drive - at least 2GB
Also try

1. Start Flight Simulator X.
2. On the main screen, click Settings.

1. On the Settings screen, click the following tabs in turn. On each tab, move the slider to the left to the Low or Medium setting.

Graphics
Aircraft
Scenery
Weather
Traffic

and check the size of the paging file - control panel - system - advanced system settings - on performance click settings button, then advanced tab.


Please also explain where you have obtained system showed 4KB then 3KB - details from.