Some time ago I downloaded and tried to install a bunch of different linux distributions (hate the word distro) and nomatter what dist i tried to install I always kept getting a message from my bios telling me there's no OS or something on the drive and I was getting really annoyed by it so I tried installing fedora on my moms computer and I had the same problem, then I found some info on how to install the bootloader manually using the commandline and it worked on my mom's computer, but made no difference on my computer. I can't remember but I think that it told me it couldn't find fedora (not sure, can't remember). But in any case I don't really understand why none of the dists couldn't install the bootoader to the mbr, even thought I specified that I wanted one in the dists where I had the option. Also, when trying to overwrite fedora with windows, it wouldn't put the "windows-nt-stuff" in the mbr. I had to do a fixmbr->fixboot to get it to work.