Wmplayer.exe – Application Error message on Windows

Someone please help me with this issue on Windows Movie Maker. I have restarted the machine several times for this error message and I do not want to keep rebooting the machine every 30 minutes this error pop’s up.
I have the application on my Windows XP machine. The application words fine for 20 to 30 minutes without any issues, later it gives the following error message and crashes.
It makes my machine completely irresponsive after it crashes. Does it mean that I have a bad RAM?
wmplayer.exe – Application Error
The instruction at “0x078f0807” referenced memory at “0x08be8c30”. The memory could not be “read”.
Click on OK to terminate the program
