Originally Posted by NitraMo
I have win7 and vista on the same hdd but different partitions, both win7 and vista think that they are the C: drive and vista wins the boot fight and simply boots itself never giving me the option to chose win7.
But simply booting from the win7 disc makes the boot correct, I don't even have to push a key at the push a key if you want to boot from the disc part.
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That's because you're really booting off the CD and the CD's bootloader is picking the Win7 part. after you don't press a key. You can probably fix it by marking the Win7 part. as active. You'd then have to use bcdedit to add the Vista part. as a second boot option if you want to dual-boot still. There are GUI bcdedit frontends that you can find via Google if you don't want to mess w/ the CLI.
As for the OP, the easiest way - as mentioned - is to boot off the Win7 disk, format the partition (or delete it and resize the Win7 partition) and then run startup repair which will fix the bootloader stuff for you.