1. Open AVG software -Click Tools > Advanced Settings
2. Go to Resident Shield and Click Exceptions -> Add Path
3. Choosing the iTunes software folder C:\Program Files\iTunes and C:\Program Files\iPod
4. Click on the iTunes folder and select "OK."
5. On the next screen, click "Apply."
6. Then exit the AVG software.
After doing the above steps, turn off the computer for a re-start and open your iTunes.