Mark,
Why isnt' there clear instructions saying: "Right-click the avast! icon in the notification area/system tray to access registration information, main program...."?
Well, if you received the registration key by e-mail, the instructions were in the mail, weren't they? The following text is copied from the mail message you should have received:
------[snip]--------
Insert the key into avast!4 this way:
1) Right-click the blue icon representing the resident protection (a) in system tray and choose "About avast!", or in simple interface choose MENU -> ABOUT AVAST!.
2) Press the "License key" button in lower right corner.
3) Enter the license key into prepared text field.
4) Press OK.
------[snip]--------
OK, I admit, this info could be on our web pages as well, but...
Vlk