windows failed on dual boot

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http://www.linuxquestions.org – ok now i do not get this i have a computer here that i installed ubuntu 10.04 on it side by side with windows using the ubuntu installer now windows will not boot at all it just restarts every time we try to boot into it now im not stupid i tryed reparing the os many times with the disk no luck when i was exploring in the windows cds command line it showed that his intire os was moved to the d:/ so i do not know how to fix that any help would be much appreceated (HowTos)