http://www.bleepingcomputer.com/tutorials/tutorial143.html
Lets see if we can restore the pc back to where it worked right.
Close and save any documents that you may have open.
Click on the Start button to open your Start Menu.
When the Start Menu opens click on the All Programs menu option.
Click once on the Accessories Start Menu group.
Click once on the System Tools Start Menu group.
Click once on the
System Restore icon. After you click on the icon, if a User Account Control window opens you should click on the Continue button.
You will now be at the System Restore screen
By default, Vista will already have selected the Recommended restore option. This restore point is one was made after a new program, driver, or update was installed. If you would like to use this restore point, you can click on the Next button to start the restore process. On the other hand, if there is a more recent restore point that you would like to restore you should select Choose a different restore point and press the Next button. This will bring you to a screen, as shown in Figure 2, that contains a listing of all the available restore points that you can restore to.
You should select the restore point that you would like to restore and press the Next button to start the restore process. Vista will display a Window showing your selected restore point and asking you to confirm that this is the one you would like to restore.
If you would like to select a different restore point press the Back button. Otherwise you can press the Cancel button to exit System Restore or the Finish button to begin the restore process. If you selected Finish, Vista will display a second prompt asking you to confirm that you would like to continue the restore.
If you are sure you want to do the restore, then press the Yes button. Vista will now log you off of the computer and start the System Restore process as shown in Figure 5 below.
When the restore has been completed, you computer will be restarted and when Vista boots back up it will be restored to its previous state. When you log in to Vista for the first time after the restore, you will see a message showing that the restore was successful.
If there are any problems with your computer due to the last restore, you can revert back to your previous settings by going back into the System Restore Utility and selecting the Undo System Restore option and pressing the Next button.
Your computer should now be working properly again.
