SIM not recognized

I installed AVG antivirus. When I changed my SIM the mobile is no longer accepting the new or old SIM. I don't know what to do. Can you help?

Hi Alaa,
Please refer to http://support.avg.com/SupportArticleView?urlname=Unlock-a-device-locked-by-AVG-AntiVirus-for-Android .
Thanks

Hi Alaa,
Please refer to http://support.avg.com/SupportArticleView?urlname=Unlock-a-device-locked-by-AVG-AntiVirus-for-Android .
Thanks