Comment 1 for bug 1265192

In Ubuntu Forums we have seen at least 4 or 5 users with exactly the same issue.

Installer only offers to reinstall Ubuntu but then overwrites entire hard drive. First thought it was user issue, but many have reported it and described consisently what they have done.
On re-install it only sees Ubuntu not Windows, but does not reinstall to an existing Linux partition, but does the install to entire drive.
Best to only use Something Else on re-install. But auto install should not offer incorrect choice.