I had 3 Installations of windows on my machine previously and all were bootable. The drive letters were C,D,E .I chose to format C drive and install Ubuntu on it. Ubuntu installed perfectly and got running. However I cannot boot my other two installtions of windows now. Also any attempts to reformat and re-install windows on the same partition on which ubuntu is installed have all failed and now I find my self stuck so please help me urgently
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