Sorry Mr-Bisquit, but in the current case your advice is unfortunately wrong.
The main source of information is the wubi site itelf on http://wubi-installer.org/
Wubi is a new implementation of the old concept of having Linux installed on a Windows system with unchanged partitions - the ancient version was named win4linux or something like that (haven't used it since over a decade). The old concept worked by launching a startup executable where all control is taken away from the running operating system (CPU super user conditions, memory cleaned, etc) and Linux is booted. Wubi appears to install a boot manager launched at an early Windows boot stage, but otherwise accesses data from the unchanged Windows partition in a similar way. Wubi keeps most of the files in one folder, which takes ca. 5 GB disk space.
You keep Windows as it is, Wubi only adds an extra option to boot into Ubuntu. Wubi does not require you to modify the partitions of your PC, or to use a different bootloader, and does not install special drivers. It works just like any other application. Wubi is spyware and malware free, and being open source, anyone can verify that.
When you reboot the computer after installation you can choose to run Windows or Ubuntu - a boot manager should show up, if installation was flawless.