There is no wizard with 2000. According to the Help file, it should be automatic in Windows 2000.
And it won't have... it works transparently in background, without need to change any setting.
I set up my e-mail account in OE and then installed Avast. I can no longer get my mail. Errors connecting.
Did you allow avast to connect into the firewall settings?
C:\Program Files\Alwil Software\Avast4\ashWebSv.exe (avast! Web Scanner)
C:\Program Files\Alwil Software\Avast4\ashMaiSv.exe (avast! e-Mail Scanner Service)
C:\Program Files\Alwil Software\Avast4\Setup\avast.setup (avast! Update executable)