You have a screwed up installation, sorry for getting technical
It would probably be best to first Download the latest version of avast
http://www.avast.com/eng/download-avast-home.html and save it to your HDD, somewhere you can find it again. Use that when you reinstall avast 4.7.1098..
Did you run the uninstall utility as Tech mentioned in item 3 as that should have removed the folders. However since you have some renamed folders, the ones with (2) may not get removed as it wouldn't be expecting that.
It is essential to reboot between stages.
After running the uninstall utility, check and ensure the Alwil Software folder and all sub folders have been removed.
Then and only then, install avast 4.7.1098 (the current regular release), reboot and enter your registration key again.
Check that your installation has completed correctly only one avast4, data, English folder, etc. If so then using the aswbeta.exe try to update to the 4.8 beta.