How to boot windows 7 after installing ubuntu 12.10 alongside?

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http://askubuntu.com – I'm new to linux and am interested in learning it so I installed ubuntu 12.10 yesterday. Installation went smoothly and I chose "install alongside windows" option and I set about 50 gb using that slider and I thought I used 50 gb from c: drive but to my shock it used 50 gb space from f: drive. This was my first shock. When I restarted and tried to log into windows, nothing happened except a black screen appeared saying "To restart press alt+ctrl+delete" but even pressing that it wont restart. No matter how many times I try rebooting, windows is not booting; same black screen saying restart ap (HowTos)