After an automatic Windows update was completed I shut down my computer but when I booted it again, the monitor went a bit blur with small blue Lines appearing when Windows start and the quality of the resolution was significantly lower. Also the computer became slower however I was still able to use the system. Then i decided that a format-reinstallation of Windows 7 ultimate from the cd would solve the problem. Hence, I booted the Windows 7 via cd and followed the standard sequence of installing Windows and clicking on custom (advanced) and deleting the partitions. When the Windows finished collecting the necessary Information and required to restart i did not press any key to boot from CD as i was suppose to and after Windows started and registry was set up, the last step of completing installation of Windows was on its way. However, after the step finishes, a black screen appears and although it should have displayed the "press any button to boot from cd" that would lead to the creation of username and name for pc etc, but instead it displays just a black screen with a flashing cursor along with white dashed vertical Lines. If i leave the screen like that then the system just restarts like nothing happened and the Windows error recovery pops up appears but even if i start Windows normally then the loop starts where the system just restarts.
I have tried system recovery and entering safe mode however in both attempts it failed as windows don't exist to enable a safe mode boot.
Thanks for your time taking to read my post and gradually you can help me solve the frustrating problem that I have encountered.