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I was installing ubuntu (13.04) and it somehow whenver restarts to complete the install starts installing again!!! So, I did not go ahead and wanted to use windows 7 which is already there on my vaio. But now, it says no operating system found!!

Would be glad if someone could help. (Actually it was saying many times during install that no device on port 2 or something like that)...

Thanks in advance

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Take a look at This. – Mitch Sep 7 '13 at 6:30

Suggest you follow the instructions from Microsoft to restore your Windows 7 installation. There are numerous tutorials to do that. Here's one example:

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Whilst this may theoretically answer the question, it would be preferable to include the essential parts of the answer here, and provide the link for reference. – Braiam Sep 7 '13 at 3:38

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