can`t boot to win7 x64 after formatting ubuntu12.0.4

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http://askubuntu.com – i got a new laptop sonyvaio E-series wiht win7.i installed ubuntu12.0.4 x64 but i formatted ubuntu partition due to some booting problems.from then i`m unable to boot with previous win7 and recovery disk for win7 is unable to load though it is available .how can i regain my previous booting from win7? (HowTos)