Problem booting Windows after failed installation Ubuntu 12.04 alongside Windows 7

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http://askubuntu.com – I tried to install in my laptop Ubuntu 12.04 so that I can dual-boot with Windows 7. I made some mistakes during this process and I didn't manage to install Ubuntu. But my real problem now is that I'm afraid that I also destroyed the installation of Windows 7. Your help would be precious for me. Here are the details of what I did: 1) I followed these instructions to dual boot Ubuntu 12.04 and Windows 7: http://www.linuxbsdos.com/2012/05/17/how-to-dual-boot-ubuntu-12-04-and-w... The only difference from what is described above, is that in my case the device names where: /dev/mapper/is (HowTos)