My computer or the device might not be check

Hi, I'm trying to update my applications but app store said said: (your computer or the device cannot be verified. Contact technical support for assistance).
Please guide me what to do.actually that it happened after I cleaned my iMac with AVG Cleaner application.
I'm on iMac with OS X El Capitan version 10.11.3 (retina 5K, 27 inches, end of 2014) (15 d 21)

Go to Library/Preferences/SystemConfiguration/NetworkInterfaces.plist. Move the NetworkInterfaces.plist file to the trash. Restart your Mac.

If that doesn't work then contact the Apple Support:

Apple Store Customer Service at the the 1-800-676-2775 or see the online help for more information.

Contact product support and tech: Contacting Apple for support and service - this includes

numbers of international calls...

Mac App Store: Apple - Support - Mac App Store.

For iTunes: Apple - Support - iTunes.

Tags: Mac OS & System Software

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