Grub2 error booting Windows. Invalid signature

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http://forums.fedoraforum.org – I have installed Mint and Windows 7 on different partition. I boot Mint and added that to 40_custom Code: menuentry ¬ďWindows 7″ { set root=(hd0,1) chainloader /bootmgr } and Windows is installed in Code: blkid /dev/sda1: LABEL="Windows7" UUID="0484706A8470605A" TYPE="ntfs" When I restart and try to boot Windows 7, it shows me error. Code: Invalid Signature TYPE="ntfs" What colud be the problem? (HowTos)