If you use Steam Guard blocked all attempts to log in to the Steam account with unauthorized computers, i.e. you can run your account and play it only on one computer. This option is used to reduce the risk of theft of account and purchased games in it.
Update your Steam to the latest available version. Usually update automatically, but you must carry out an additional check using the link "Check for updates" in the program window. To activate Steam Guard, you need to use the newest version of the program.
Confirm tied to your account account e-mail. To do this, click on the "Settings" section. If the address is not confirmed, click on the "checkout" button, and then navigate to the account used email service. Enter the message code in the corresponding field in the Steam client to confirm that you log in to your account.
Restart Steam again and return to the "Settings" section. If the bind operation e-mail was successful, you will see the status "Confirmed" in front line with your email address.
Go to the tab "Account" and select "Manage Steam Guard". Check the box next to "Enable protection" to activate the mode, then press "OK".
Enabling Steam Guard is complete. Now, to go into a Steam account on another computer you must login using your mailbox. When you try to log in from a new device to your account you will receive an email notification with code for a work authorization from the same computer on which you run access.
To disable Steam Guard, uncheck the appropriate item under "Settings". Disabling this option will reset the settings on other computers.
Advice 2: How to disable steam guard
Steam Guard is a special function of protecting the account on the game servers Steam. It prevents hacking of user account and access from unknown computers. At the request of the user, Steam Guard can be disabled.
Activate Steam Guard automatically immediately after registering a new user account and the procedure of confirmation by e-mail. If you are using unregistered or has not yet activated the Steam version, access to some settings including Steam Guard, will be closed. Navigate to the General settings of Steam client and check whether your account is confirmed. If you have already had this procedure before, in front of your e-mail will be marked "Confirmed". Otherwise, confirm the email address tied to your Steam account before proceeding.
Get e-mail a special code to access the Steam client, which will act only on your computer. In the future, as soon as you turn off Steam Guard, you can run the client without having to obtain and enter the code. Launch Steam and log into your account using the resulting combination.
Click on the Steam icon in the top left corner of the program and go to "Settings". Click "Manage Steam Guard" which is under "Account". Activate the checkbox "Disable Steam Guard" and save the settings. Now the protection of your account will be deactivated. If necessary, you will be able to reactivate the function in the same section.
Think twice before you disable Steam Guard. Hacking accounts on Steam is a pretty common phenomenon, so the developers of the program is not highly recommended to deactivate the protection. However, disabling Steam Guard can affect a user's ability in various games, for example, some servers Counter Strike lowers the reputation of those players who come into the game with an unsecured account.