PythEch
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An example of error message:
Some users get this error. They can connect to their Steam account via "steampowered.com", but cannot login with Steam Client.
A friend of mine got this problem too. As I saw in the Steam forums, they solved their problem by uninstalling the "Advanced SystemCare" Pro or Free Utility.
The Advanced SystemCare (ASC), blocks the latest Steam update, so, the users cannot login to their account.
In order to fix this, you need to uninstall the ASC, and then login to your account by running Steam Client.
After that, you can reinstall the ASC or not, it's your choice. It will not block you again to play Steam games
If you still cannot login, try reinstalling Steam, disabling antiviruses etc.
Last solution is to find the program which blocks the Steam.
Best regards...

Some users get this error. They can connect to their Steam account via "steampowered.com", but cannot login with Steam Client.
A friend of mine got this problem too. As I saw in the Steam forums, they solved their problem by uninstalling the "Advanced SystemCare" Pro or Free Utility.
The Advanced SystemCare (ASC), blocks the latest Steam update, so, the users cannot login to their account.
In order to fix this, you need to uninstall the ASC, and then login to your account by running Steam Client.
After that, you can reinstall the ASC or not, it's your choice. It will not block you again to play Steam games
If you still cannot login, try reinstalling Steam, disabling antiviruses etc.
Last solution is to find the program which blocks the Steam.
Best regards...