Just because you see a report that this file is missing does not mean that you need it. It is probably a residue of a virus that your virus scanner killed. You now need to find out what generates the warning, then deal with it. Here is now you can do it:
- Boot into Safe Mode
- Click Start
- Type the word msconfig into the Search box and press Enter
- Untick every tick mark under the Startup tab.
- Click the Services tab, then tick the box that hides the Microsoft services.
- Untick every remaining tick mark.
- Physically disconnect the machine from the Internet.
- Reboot in Normal Mode.
- If this fixes the problem, restore the tick marks in groups of 8 until you find the culprit, then leave it unticked.