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I have been trying unsuccessfully to switch from Ubuntu 12.04 LTS on my pavilion a600n machine back to Vista, and I was positive I had it installed to run parallel with Windows. Now I find my password doesn't let me log into Ubuntu, and no matter what I do, I cannot get back to Vista either. In essence, I have a paperweight; no backup/ restore disk for Windows, and Ubuntu that can't access the internet because the wireless connection I have doesn't understand Linux (I have to buy a new one, I figured that out already).

All I really need to be able to do is be able to select which OS at start-up and reset my (admin) password from the log-in screen so I can get into Ubuntu. Any and all help would be greatly appreciated!

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boot gparted live cd,delete ubuntu partition and then run boot-repair. –  Avinash Raj Dec 8 '13 at 7:01

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