Download the free version of EasyBCD, install it within Windows, and use it to edit your current boot menu to include your new Ubuntu installation.
Just scroll down the page a little, and register to get it.
Otherwise, if you are seeing the Grub boot menu, then your question should (and probably will) be migrated to the Ask Ubunty exchange, and closed as it is essentially the same as this question here http://askubuntu.com/questions/82928/how-to-make-windows-boot-firsthttps://askubuntu.com/questions/82928/how-to-make-windows-boot-first and the chosen answer there regarding how to edit your boot menu will also solve your Grub editing issues.