You can install Ubuntu into a file on the Windows filesytem (See Wubi). No need to create an extra partition.
in reply to Re: Why is Windows 100 times slower than Linux when growing a large scalar?
in thread Why is Windows 100 times slower than Linux when growing a large scalar?
This will also not overwrite the Windows-Bootloader (as GRUB et al. do) but use the Windows-Bootloader to start Ubuntu.
Btw, does anyone know what happened to the "Linux In a Window" (under Windows) that i recall from the day of Win98?
You can lead your users to water, but alas, you cannot drown them.