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Steam Support
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You selected the issue: Steam Client crashes
Opt into Steam client beta
In the Steam client, go to Steam in the top-left > Settings (Preferences on Mac) > Account tab > Under Beta participation click Change > Select Steam Beta Update
Disable conflicting programs
Some third-party programs have been found to conflict with Steam Controller functionality. Try disabling these programs and restarting your computer.
  • Razer Synapse
  • XInput emulators
  • Screen capture software (Fraps, etc.)
  • Skype, Skypehost
  • MSI Afterburner
  • ASUS AI Suite
  • ZoneAlarm
Restart your computer
Unplug your Steam Controller and other input devices, then restart your computer.
Reset Steam installation
Uninstall, then re-install Steam on the C: drive.