I think Kurt was asking if you can delete the install of 8.4 via
Wubi just as you would a program and the answer is yes. It loads just
like a program and unloads the same
Wubi

There is a new installation option for Windows users. Wubi allows users
to install and uninstall Ubuntu like any other Windows application. It
does not require a dedicated partition, nor does it affect the existing
bootloader, yet users can experience a dual-boot setup almost identical
to a full installation. Wubi works with a physical CD or in stand-alone
mode, by downloading an appropriate ISO to install from. It can be found
on the root of the CD as Wubi.exe. A full installation within a
dedicated partition is still recommended, but Wubi is a great way to try
Ubuntu for a few days and weeks before committing dedicated disk resources.