XMS

I AM WORKING ON A PC THAT CRASHED. AFTER SANDISK REPAIRED NUMOROUS ERRORS,SO MANY THAT IT RAN OUT OF FILENAMES. I REBOOTED WITH THE STARTUP DISK AND RECEIVED 2 ERROR MESSAGES.1 EXTENDED MEMORY SPECIFICATION NOT WORKING. 2 XMS DRIVER NOT INSTALLED. WHERE DO I GET AND HOW TO INSTALL IT? IF IT MAKES A DIFERENCE ITS A INTELL CELERON 366.