Cannot boot to Win7

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http://forums.fedoraforum.org – Dear Fedoraforum's users! Initially I had win7 on my laptop. I have formatted one partition (sdb2) with no data on it from ntfs to ext4 to install Fedora17 After formatting and installing I cannot boot to win7 anymore. When pick Win7 in menu I have: "Windows failed to start. A recent hardware or software change might be the cause" and offer to insert an installation disc. In my /boot/grub2/grub.cfg file I have following lines: menuentry 'Windows 7 (loader) (on /dev/sda1)' --class windows --class os $menuentry_id_option 'osprober-chain-62082D74082D47FD' { insmod p (HowTos)