Re: !Help Needed! Ubuntu won't start on HP Windows 8
WUBI has problems running in Windows 8. This is the reason perhaps, why WUBI was dropped from 13.04. That is your problem. Even if it ran well earlier Windows8 updates will break it.
Consider Removing it completely from Windows and re-install Ubuntu as 'true' dual-boot in its own partition. Read: https://wiki.ubuntu.com/WubiGuide#Uninstallation to safely remove WUBI. But first BACKUP any important DATA that you may have saved there. Reboot Widnows8 a couple of times to ensure that there are no problems with Windows. Windows 8 'hibernates' secretly rather than 'shut down' make sure you 'shut it down'.
If you decide on 'true' dual-boot then let us know and we'll help you with it.
"Evolution is Nature's way of issuing upgrades."