Culpeper uses SpamPal, he can guide you…
I use Spamihilator (John- started to use it some time ago).
If you search the forum for my posts of Spamihilator you will find the configuration to use it and avast! at the same computer. You will have to change your emails accounts and your port for receiving emails (POP3 port).
If it is difficult, please, wait… I’ll back in February 8)