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Steam is generally pretty stable, but every now and then you’ll run into a problem.

This guide gives solutions to common problems you’ll encounter in Steam, from games crashing or not working properly to Steam failing to launch.

After deleting this file, you’ll have to log back into Steam and other local settings will also be lost – for example, you’ll have to re-categorize your games.

You’ll find this file in your Steam directory – C:\Program Files (x86)\Steam by default.

Right-click your taskbar and select Start Task Manager to open the task manager.

Be sure to change Steam’s CPU affinity back to the default – using all cores – before launching a demanding, modern game.

If Steam detects it’s running in compatibility mode, you’ll see a message like this one: If you right-click the Steam shortcut and select Properties, you won’t see any compatibility settings being applied: Windows has hidden the compatibility mode setting it applied – you can only remove it from the registry.

Some old games may also have graphical issues with Steam’s in-game overlay – the screen that appears when you press Shift Tab while in a game.You can tell Windows to run on the game on only one CPU core to solve this problem – this is referred to as setting the game’s CPU affinity.The easiest way to do this is by launching a game, alt-tabbing out, opening the task manager, right-clicking the game’s process on the Processes tab and using the Set Affinity option.Browse to the HKEY_CURRENT_USER\Software\Microsoft\Windows NT\Current Version\App Compat Flags\Layers key in the registry editor and delete any values associated with Steam.Steam should now launch without any compatibility mode errors.

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