you could try a program called g-parted to get rid of the new partition. Then once you've done that try booting.
if that doesn't work, you could try the windows repair disc again.
no need to lose all your data though. if you've got another pc/laptop handy you could plug that hard drive into it and access it from within the OS of the other pc to recover data you want to keep, then reformat and install windows fresh.
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