What I appears to me is that you have a standard Ubuntu dual boot with Vista that has been set up by Ubuntu.
The problem is that Ubuntu by default over-writes the standard windows boot loader with the Linux grub loader.
I assume you are not a "Linux Expert" so need to make your changes from within Vista. To do this you will need a Vista Boot DVD, to repair the system after you remove Linux.
If you post back in addition to Shawn's request, if you have a bootable vista install disc we should be able to guide you through it