When attempting to start a Valve game, I see the Engine error: Could not load library client when launching the game. How can I fix it?
Please completely log out of the Steam client (make sure it is not running in your Windows Taskbar) and then re-start Steam. This should correct the issue.
If the issue continues and Steam is installed to a location containing letters or symbols not contained in the English alphabet (such as accents), please move your Steam installation to a directory that does not contain these characters, such as C:\Steam. Please see the Moving a Steam Installation article for instructions on doing so.
The Steam Client Service is a required component of Steam on Windows Vista and Windows 7. If the Service is not operating properly, certain Steam functions may fail.
To repair the Steam Client Service, please do the following:
PC Tools Spyware Doctor is known to cause this issue. Please see Programs Which May Interfere with Steam for more information on resolving this issue.
This issue can be resolved on some systems by verifying the game cache files at least once and relaunching the game
If you see further errors, please contact Steam Support.