Jad,
have no solution for your specific problem, but as an alternative to AVG I would recommend AntiVir (also free) from www.avira.com.
and I have a question too: does AVG 8 still allow to install without "active" on-guard scanner? this would provide a means to have two free av-tools installed, one active and on-guard, the other one as on-demand when one wants to get sure.