Running Steam in Windows compatibility mode is not recommended. Please remove any Windows compatibility settings for all users under file properties for Steam.exe and restart Steam. Press 'Cancel' to permanently ignore this warning and continue.

Just happened to try and start Steam and got the error message above. If you happen to get it you're probably running Windows Vista or 7. Apparently Microsoft has a Compatibility Assist program that enters Steam as a registry key so the solution is to remove those keys:

1. Hit start->run->regedit
2. Go to key: HKEY_CURRENT_USER\Software\Microsoft\Windows NT\CurrentVersion\AppCompatFlags\Layers
3. Look for an entry with your path to steam.exe
4. Delete that entry
5. Repeat steps 3 and 4 for HKEY_CURRENT_USER\Software\Microsoft\Windows NT\CurrentVersion\AppCompatFlags\Layers

Thanks to all the other guys that discovered this solution before me, but thought I'd spread the word :).

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