Installing anti virus Kaspersky instead of AVG

I bought a Kaspersky Antivirus but before I could start to install it, a message appeared saying I have to remove the other existing Antivirus on my computer. The existing Antivirus according to the message is "AVG 8". But I couldn't find the software, I tried overwriting this AVG 8 by installing the free trial version of AVG 8.0 thinking the two are the same.
I uninstalled the AVG 8.0 and tried again to install the Kaspersky Antivirus, the same message popped up again.
