Avast 4 server edition

I need help, I installed avast 4 sefver edition and when
I try to remove it it gives me an error message

Avast!
a setiface error has occured: 3
try to reinstall or contact support please.

If anyone could help me resolve this issue that would
be great.

Thanks,
Steve

Look in the folder \setup. Is there a file called setiface.dll?
If not, is there a files called setiface.ovr? If you see such a file, copy it to setiface.dll.

Ie.

copy setiface.ovr setiface.dll