Please see the image below - http://i.imgur.com/h6bPT.png
I have tried looking into regedit and deleted what I could find avast related, used Spybot S&D to find system internal error (and delete) however I have now come to the end of my capabilities regarding this.
FYI - Avast was fully up to date, having reinstalled it fully in case there were some files not uninstalled previously. This has come to nothing.
Bare in mind I am upgrading my current Windows 7 Ultimate to Windows 8 Pro, which is fully compatible. The only issue stopping me from upgrading with this given path is this program which isn't even installed (control panel > Programs) on my machine. I do not want to lose any of my data/programs so other install options are not open to discussion.
Please offer any help or assistance, I would assume many others may have this issue.
Steps taken already (to do this, I am reinstalling the program in order to remove it - odd I know);
Uninstalled via aswclear.exe in safe mode and still showing as incompatible.
Attempted thorough advanced uninstall using Revo Pro trial. No luck.