Re: Dual boot problems
It sounds like installing windows messed up GRUB, the program that lets you choose an operating system. Don't worry, your Ubuntu installation should still be there, it's just not starting.
Try boot repair:
The main difference between Windows forums and the Ubuntu forums is that the Ubuntu forums has hundreds of questions and thousands of answers, but Windows forums just have hundreds of questions.
As for the OS X forums, I wouldn't know, I'm too poor.