Why Ubuntu 12.04 doesn't recognize my Windows 7 partition?

view full story

http://askubuntu.com – After some problems trying to install Ubuntu alongside Windows 7, now I have Windows 7 installed and it works just fine. But when I am going to install Ubuntu it doesn't recognize my windows. What should I do to see Ubuntu in my PC? My Ubuntu version is 12.04 64 bit. PC specs: Asus crosshair IV formula AMD phenom II x6 1055t @ 4.1GHz Corsiar 4x2Gb 1766 @ 9-9-9-24 AMD Radeon 7870 GHz edition WD 1TB caviar black (HowTos)