Switch your laptop off.
Turn your laptop on and press the F8 button during the initial start-up process.
Use the up/down arrows to select 'Safe Mode with Networking' and press the 'Enter' key'.
Your screen will probably look rather odd but don't worry, it's normal!
Launch your web browser.
Come to this thread.
Click this link:
https://support.microsoft.com/en-gb/kb/947215
Scroll down to 'Method 3'
Click 'Download' (in the blue box)
Click 'Run'. (If you only see a 'Save' option, accept it instead. Save the file to a suitable location - your desktop will do - and then double-click on it to run it).
Restart your laptop.
Cross your fingers!