The operating system on your computer is Microsoft Vista.
Windows Vista comes with a rich feature set of diagnostic and repair tools that you can use in the event that your computer is not operating correctly. These tools allow you to diagnose problems and repair them without having to boot into Windows. This provides much greater flexibility when it comes to fixing problems that you are not able to resolve normally. Do the foll. :-
To start this process, insert the Vista DVD into your DVD drive and turn your computer on. Your computer will start and you should see your BIOS listing your hardware and other information. When that information is cleared, your computer will see that a bootable DVD is inserted and present a prompt similar to the figure below :-
Incase you do not have your Vista disc (DVD), then your computer MAY be having a Recovery Partition : you boot the computer and immidiately go on tapping on the F8 key, untill you see Windows Advanced Options
: using the up & down arrow keys, highlight Repair your computer
and then proceed as below :-
As you want to boot the computer from the Windows Vista DVD you need to press a key, and any key will do, on your keyboard when you see the above prompt. After you press the key, you should hear your DVD reader spinning up and then you will see a black screen with a white status bar at the bottom stating Windows is loading files.... After a while, the status bar will turn completely white and you will see a screen stating that Windows is loading. The Windows Setup environment will continue to load and when finished you will be presented with a screen similar to Figure below.
At this screen you should configure the Language to install, Time and currency format, and Keyboard or input method options so that they are set correctly. When done, press the Next button. You will now be at the main Windows Vista setup screen where you would normally install Vista on to a computer.
As we want to repair the computer, you should click on the Repair your computer option. This will bring you to a new screen where the repair process will look for all Windows Vista installations on your computer. When done you will be presented with the System Recovery Options dialog box as shown in Figure below.
Press the Next button to continue
The repair process will now display the System Recovery Options screen. If you get any other options, then click on View advanced options for system recovery and support,
to get to the System Recovery Options,
as in the figure below :-
Click on the Startup Repair
The Startup Repair tool will attempt to fix your computer and get it booting up again.
If Startup Repair finds a problem with an important operating system file, the tool may suggest a solution of some kind that you have to confirm or may solve the problem automatically.
Whatever happens, follow the prompts as necessary and accept any changes suggested by Startup Repair.
Your computer may or may not restart several times during this repair process. Do NOT
boot from the Windows Vista DVD on any restart.
Click the Finish
button once you see the Restart your computer to complete the repairs
window to restart your PC and start Windows Vista normally.
The above steps most probably should resolve the issue with your computer.