Thank you for your response.
Oh yeah, of course you can only run one OS at a time.
I tried installing OpenSUSE just before. It worked until I restarted then there was an error that loads right after my motherboard screen.
(Or something like that) I loaded the OpenSUSE DVD again and deleted all the partitions and files of openSUSE because it installed some files onto my internal HDD and it wouldn't boot properly. I found a website that shows me how to do it
I will give this a try tommorow morning.
Thanks for your help.