Ubuntu does not offers me "install alongside Windows"

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http://askubuntu.com – Any of the partitions make in Windows was not recognised by Ubuntu, or Zorin OS, or LinuxMint... It's like a blank hard disc... 250 gb free... I'm a new linux user, but what confuses me is that I was able to install Ubuntu alongside Windows on my laptop with no problems, but on PC ... no way! Help, please :-( (HowTos)