The Ubuntu 12.04 I have installed (in Dual-Boot with Windows 7) using WUBI worked perfectly for over a month. Then it informed me that I ran out of space on the hard drive and I assumed it was because my hard drive on Windows was full. I logged into Windows and deleted the whole New Volume D.

But now the problem is that it is not possible to log into Ubuntu but in Windows it's possible. I really paid attention about not deleting important files in Windows. When i try to log into Ubuntu : _either it does not go far and i have to restart the computer _or it goes until the loading time and a message says something like "[...] Graphics could not be detected [...]" and they ask to choose between 4 options including "Start with poor Graphics", "Reconfigure Graphics", "Troubleshoot" and "Restart the computer". But none of the options run and i also have to restart the computer manually from that point

I have plenty of useful files in Ubuntu so i want to find another way to solve the problem instead of Uninstall/Reinstall Ubuntu. I want to know what happened ? And how to make it work ?