Computer has slowed very much since I installed AVG 2015 ULTIMATE

I have unistalled all my old Virus protection but since stalling this new AVG 2015 ULTIMATE, MY COMPUTER  has slowed down too much.
please help .
thanks

Hello Mahmood. I am sorry to hear that. I kindly request you to check whether the Performance part of the AVG Ultimate installed properly and please run a maintenance using the AVG Performance and please let us know if the issue persists. Please feel free to contact us back for further assistance. Thank you.

Hello Mahmood. I am sorry to hear that. I kindly request you to check whether the Performance part of the AVG Ultimate installed properly and please run a maintenance using the AVG Performance and please let us know if the issue persists. Please feel free to contact us back for further assistance. Thank you.