Yeah, if you install Ubuntu first, windows will go in and wipe the bootloader so you can only access windows. Ubuntu keeps the windows bootloader and adds options for It so you can access both, automaticly.
Hope your installations are successful!
And tell me how it goes when your done. I like to know if stuff worked out.
Edit: Feel free to ask any more questions, but I won't be able to answer them for a couple of hours.