Download update and install:
Then re-install WAW as much as possible.
Then start Revo and choose WAW from the list.
Choose the advanced option, following all the prompts, and remove all registry entries relating to the game.
Even if you can't install the game at all, use the Tools>Junk file removal option to scan for junk left behind by corrupt installation.
When you have done this try re-installing with your Anti-virus and firewalls OFF.