no windows 7 entry in grub after installing ubuntu

I have resolved a Grub menu issue (Ubuntu 11.04 + Win7) with a software Grub Customiser. Good luck.

This has happened to me several times when setting up multi-boot systems and I have always been able to fix it by running sudo update-grub.
Fortunately, update-grub is very straightforward and it will tell you exactly what it is putting in your GRUB menu, including Windows. I have seen some CRAZY solutions to this problem proposed on the forums, I've even tried some of them (and they didn't work). You really owe it to yourself to try update-grub before anything else though.