That Windows 7 is detected as Vista is already reported as bug 393565
Please attach or paste your boot.ini on /dev/sdc1
AFAISC os-prober just extracts the value from it as the OS name.
Mabye you just had 2000 installed or copied that file from a 2000 system?
** Package changed: grub2 (Ubuntu) =>
** Attachment added: "Dependencies.txt"
http://launchpadlibrarian.net/31745823/Dependencies.txt
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Windows 7 RC wrongly detected as Win Vista
https://bugs.launchpad.net/bugs/428823
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