Second Hand Professional Camrecorders How Do I Know If I Have 2 OS"s Running On My Second Hand Computer I Just Bought ?

How do i know if i have 2 OS"s running on my second hand computer i just bought ? - second hand professional camrecorders

I have 2 BSOD (0x0000004f) Error message appears when you restart the computer a black screen and it was the boot options in Windows XP Home or Windows XP Professional. Does this mean that my computer 2 operating systems running on them.