Spyware Doctor® 6 VS AVG Internet Security?

I am currently using AVG Internet Security(Paid Version)* and i was wondering if i should purchase the full version of Spyware Doctor® as i heard its way better than AVG Internet Security. I want to know while running Spyware Doctor® on my pc will it affects AVG Internet Security performance too?

No you will be fine it will slow up your computer but it wont affect AVG. The reason it would slow it up is because not upon boot 2 programs are loaded into the processes. But it wont affect AVG because it wont mess with the firewall. When 2 applications mess with firewall thats when there are issues.

how to update spyware doctor with anti virus