My AVG Registered Internet Security giving this problem

Qasim, I would request you to run AVG remover tool based on your OS (32-bit or 64-bit) to completely remove AVG and then re install. To determine whether your OS is a 32-bit or 64-bit, please click on this link. http://support.microsoft.com/en-us/kb/827218

To download the remover tool, please click on this link: http://www.avg.com/utilities

@Avinash: Thank you Avinash! This has really helped me. First I removed AVG with AVG Remover Tool and then reinstalled.

But problem is that why it happened suddenly?

@Avinash: Thank you Avinash! This has really helped me. First I removed AVG with AVG Remover Tool and then reinstalled.

But problem is that why it happened suddenly?

Qasim, I would request you to run AVG remover tool based on your OS (32-bit or 64-bit) to completely remove AVG and then re install. To determine whether your OS is a 32-bit or 64-bit, please click on this link. http://support.microsoft.com/en-us/kb/827218

To download the remover tool, please click on this link: http://www.avg.com/utilities