[ubuntu] Dual grub boot help

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http://ubuntuforums.org – Ok, i have two hard drives both internal and i HAD windows on one of them but now i loaded Ubuntu 10.9 Now when my machine starts i have a choice between ubuntu. the problem is that now i have two hard drives and loaded Ubuntu 10.9 on to it. i deleted the Ubuntu partition and want to choose which one i want to boot off of. Ie: windiows or Ubuntu. Now i have an error message when ever i load up my Windows hard drive and it does'nt work (Hardware)