The following steps are applicable to disable automatic Rootkit scan on AVG Internet Security 2014:

1. Open AVG Internet Security 2014 Console.

2. Click on the 'Scan Now' settings. (See below screenshot)

3. Next, click on 'Scan whole computer' settings. (See below screenshot)

4. The final step is under- 'Scan whole computer settings', make sure to uncheck 'Scan for rootkits'. (See below screenshot)

5. Save the current settings and AVG Internet Security scan should now have rootkit scan disabled.