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If you purchased a retail package and created a Steam account, you will need to register your CD Key to activate the product. Learn how to register a key or activate a product on Steam.
If you have already activated and played games on Steam in the past but the games are no longer appearing in your list of activated games, you are most likely logged into the wrong Steam account.
You can use the Help site to figure out if you have other accounts associated with your email address or phone number. Follow the steps to find your accounts and recover them if you no longer remember the password.
Sometimes Steam will appear to be functioning correctly, except certain games will be missing from your list. If you are absolutely sure that you are logged in to the correct Steam account, then the issue is most likely that your filter is set incorrectly. Please log in to your Steam account using the Steam client and ensure that all games are visible by clicking Library > Games.
Another possibility is that some ports are being blocked by your firewall and/or router. Since Steam cannot connect on all of the ports it uses, it may run into a problem verifying one of your games. To see the list of ports and to make sure that all of the ports for Steam are open, please follow this guide.
Check your email to make sure you received an email receipt from Steam for your purchase. If you didn't receive a receipt, your purchase may still be pending. Find the purchase in your purchase history and you can select it for more details.
If your purchase was completed and you can't find the game, try logging out of the Steam Client and logging back in.
The status of Pre-load Complete means that the game is installed on your computer, but your account doesn't own it or no longer has access to it via Family Sharing. Most often this happens when people forget they have more than one account.
You can use the Help site to figure out if you have other accounts associated with your email address or phone number. Follow the steps to find your accounts and recover them if you no longer remember the password.
If games that were previously installed on your account are now appearing as uninstalled, check out this FAQ for a more detailed fix.