[merlin]

well, unless you have dual boot setup, some kind of partitioning or more than 1 HD you can only have one OS installed on your PC that actually works. If you dont have any of those, what might be hapening is that you might be seing a reference to the other OS on the boot screen but if you try to boot to it it will give you an error. I suggest a clean install as well as Drifters described it. It will save you some headache down the road. Also, please post the answers and additional questions here so we can know if your problem got solved

thanks