You may encounter a blue screen stop error while starting your Windows Vista Operating System. This usually happens when the computer is unable to access booting files or the File System. If you encounter this message, follow the steps below:

1. Restart the Computer
2. Tap the “F8” key while the computer is restarting to get to the Startup Options screen
3. From this options screen, use the arrow keys on the keyboard to highlight “Safe Mode” and then press “Enter” key
4. Once you reach the desktop of your Windows XP computer, click on “Start”à “Run” and type “chkdsk c:/f” and press the “enter” key.

This will launch the disk checking wizard which will look at the Hard Drive on your computer for any bad sectors. If there are many bad sectors, you should take back-up of your data and replace the hard drive.

If above steps do not work, follow the steps below:

1. Go to the “Safe Mode” as described above
2. Double Click on “MY Computer” or click on “Start” and then click on “My Computer”.
3. On the next screen, right click on the primary hard drive partition and on the pop-up menu, click on “Properties”.
4. On the next screen, click on the “Tools” tab
5. Click on “Check Now” button in the “Error Checking” box

Make sure that you check the option for “Scan and attempt recovery of bad sectors” on the Check Disk options screen. You can also select “Automatically Fix” file systems check box.