It seems to me that when you uninstalled the game before, it didnt work correctly. The registry file still thinks that Eaw is there somewhere but theres no exe for it.
To correct this, you will need to download a registry cleaner. Regedit is a good one, and you can find this, free , at
www.downloads.com) by typing in regedit or reg cleaner in the search bar. Install this, and follow the instructions to clean your registry. Then, reboot, then reinstall the game
DMUK