If after you install a new version the Steam version of the game no longer runs, your Anti-Virus (AV) program (e.g. NOD32) may be at fault. In which case, you will need to add the Steam.exe client as well as the steamapps/common folder to your Anti-Virus program exclusion list.
Then use Steam's "Verify game file integrity" option in order to ensure that all the game files are correct and not quarantined by your AV program.
If you still can't get it to work, either get a new AV program or try running the program by running either AAW.EXE or AOA.EXE directly from the steamapps/common folder using Explorer.
