I have installed Ubuntu over a previous Windows 7 installation using wubi.
Once the boot manager asks for which operating system I want I click on Linux, but a message comes up that says:
(Taken from screenshot from comments).
Windows failed to start. A recent hardware of software change might be the cause. To fix the problem: 1. Insert your Windows installation disc and restart your computer 2. Chose your language settings and then click next 3. Click repair your computer. If you do not have this disc, contact your system administrator or computer manufacturer for assistance. File \ubuntu\winboot\wubildr.mbr (NB: Not sure about this line, hard to make out) Starus: 0xc00000093 (NB, this may be an 8 not a 3) Info: The selected entry could not be loaded because the application is missing or corrupt.