Installer refuses to let me install GRUB. Help please?

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http://www.backtrack-linux.org – Hey there, I've been looking for about an hour now trying to find out how to fix this problem. There doesn't seem to be much info on GRUB on the web. I was following this guide: http://www.linuxbsdos.com/2012/03/22...de-each-other/ So I could install backtrack but still use the windows boot manager. However I hit many problems on the way. First... The installer never recognized my windows 7 install. So I just went into windows and shrunk my current partition by 35 gigs, giving me 35 gigs of unused space. I manually created 2 partitions, one root partition, and one for swap. Everyt (HowTos)