I have a windows XP Professional pc . About every 1/15 times i start it up i get the boot up screen as if i don't have an Operating System. Should i be concerned?
What msg ? Non System Disk ?
I would take precautions to backup your personal files. Appears something is starting to go bad. Run a chkdsk /r on your drive. If you have diagnostic software from computer Mfg or Hard drive Vendor, run that also.