XP PRO Freezing

Can anyone solve this problem please. Programs keep freezing all the time and pc goes off and reboots by itself occasionally. Also when you start up after resetting the boot screen sometimes freezes or the monitor states to check the monitor cable. The system is so unpredictable that it is now getting rather frustrating and I am loosing my cool.

 

Uncheck the "Automatically reboot" box from:SystemProperties/Advanced/Startup and recovery/setting.. Then post STOP error message

 

Thanks for that...Please explain what you mean by Post Error Message...Pretty new to this forum

 

Hilite the error message,right click on it and select "Copy",then come back here and
select "Paste" to paste into your post