help me please

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http://ubuntuforums.org – hi guys, i need your help I was having windows 8 , vista , and Backtrack 5 on my laptop unfortunately , i've removed windows vista by mistake and now i can't boot to windows 8 but i can still boot to Backtrack 5 please note that windows 8 is in my enternal hdd while BT5 is in my external hdd and when i try to boot windows 8 it says no operating system ... because it checks for windows in the formated partition , not in the partition that includes windows 8 i think that the only way to fix this problem is to change WINDOWS 8 boot options from Backtrack 5 so it will check for operating system (Hardware)