RED ALERT 3 problem.............

Please help.I am having problems playing red alert 3.The game blinks and returns to the desktop just after i have completed the mission "Oddessa" in japs campaign.Same happens when i complete the allied 4th mission and no error report or anything appears.My system is

Windows XP on Pentium 4

RAM 1 gb

GeForce 7300 GT 512 mb

3.0 mhz cpu