Avast! home edition: Reinstall problem

[system]

This morning I woke up and my Avast! home edition was looking like that:
http://store.picbg.net/pubpic/ED/6C/cb61e73daf27ed6c.jpg
http://store.picbg.net/pubpic/47/FD/90886a32ec1447fd.jpg

And when I tried to uninstall it I got this error:
http://store.picbg.net/pubpic/C5/05/d1a498bf799ec505.jpg

Any ideas how can I fix this mess?

Thanks in advance.

[Pondus]

try running Uninstall Utility before you reinstall http://www.avast.com/uninstall-utility

OBS: why don`t you install the new avast 5 and not the old 4.8 ???

[system]

It worked.
I am installing the newer version right now, thanks for the advice