HT5639 os x mountain lion cannot be installed in machintosh HD ?

Please help me... im getting this message "os x mountain lion cannot be installed in machintosh HD"... how can i install it?... thank you so much in advance!!!

are you trying to install windows on your mac?
if not then think you should try asking for help here
https://discussions.apple.com/community/mac_os/os_x_mountain_lion

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