The easiest way to fix this is to scrap wubi and do a fresh install of Ubuntu to your hard drive from a live disk as the wubi method of installation is no longer recommended (for obvious reasons).
There are tons of youtube videos that can show you how to do this on a system with 3 or more partitioned operating systems.
Boot your computer from an Ubuntu Live Disk and select to try Ubuntu with out installing.
Use the gparted application to create a separate partition formatted to ext4 for your installation and another separate partition formatted to linux-swap that only needs to be 2-4GB.
Set up a working internet connection and then click on the install Ubuntu icon from the desktop.
When you get to the portion of the installation where it asks you what where and how to install Ubuntu, "along side" or to "replace Windows", go to the bottom and choose "something else".
From this screen, right-click on the ext4 partition you recently created. Choose the mount point "/"
Choose continue, yes to make changes, and continue with the rest of the installation.