Problems with installing Ubuntu with WUBI installer
While the Ubuntu Windows Installer (WUBI) is a great concept, it should be avoided whenever possible. It’s buggy, and tends to run much slower than installing Ubuntu the regular way. The WUBI installer allows you to install Ubuntu easily from within Windows as if it’s another program. It actually installs Ubuntu inside the Windows NTFS file system and uses the Windows Boot Loader to let the user choose which Operating System they want to use at start up. WUBI makes it very easy to Uninstall Ubuntu. You uninstall just like a regular windows application by going to “Add or Remove Programs” in the Windows control panel.
If you wan’t to install Ubuntu side by side Windows, you should create an Ubuntu CD, DVD, or USB, and boot to it at start up by using the boot menu or by changing the boot order priority in BIOS. For instructions on how to create an Ubuntu CD, DVD or USB flash stick, please follow my guides “How to burn an Ubuntu CD” and “How to create an Ubuntu USB Flash Stick“.
If for some reason you just can’t install Ubuntu the regular way, then I do recommend trying the WUBI installer as a last resort.