my system was first loaded with windows 7. then i changed it to windows 8 and then susequently to 8.1. but it kept crashing frequently without no reason. the reasons i get are MEMORY_MANAGEMENT, KERNEL_NOT_HANDLED_CORRECTLY and many more. when it boots into system repair and restore it still crashes with the message IRQL_NOT_EQUAL. i reverted to 7 and then i recently upgraded to windows 10 and the same problem persisits. but windows 7 works perfectly. pls help!