If you really think it's steam, then I can tell you how you can probably fix it without having to reformat.
1. Copy and paste your steamapps folder (delete KillingFloor from it) to a safe location (usually desktop).
2. Uninstall Steam.
3. Type regedit in Run to open your registry editor.
4. Find HKEY_CURRENT_USER/Software/Valve or HKEY_LOCAL_MACHINE/Software/Valve and delete the Valve folder in whichever has it or both if two exist.
5. Find HKEY_LOCAL_MACHINE/Wow6432Node/Valve and delete that Valve folder too.
6. Reboot computer in Safe Mode with Networking (spam F8 at startup screen).
7. Reinstall Steam, do not let it log in to update. Cancel it as soon as it starts Steam after install.
8. Place your steamapps folder back into the proper place.
9. Start Steam and allow it to fully update, and then install your Killing Floor.
10. Reboot normally and try again.
1. Copy and paste your steamapps folder (delete KillingFloor from it) to a safe location (usually desktop).
2. Uninstall Steam.
3. Type regedit in Run to open your registry editor.
4. Find HKEY_CURRENT_USER/Software/Valve or HKEY_LOCAL_MACHINE/Software/Valve and delete the Valve folder in whichever has it or both if two exist.
5. Find HKEY_LOCAL_MACHINE/Wow6432Node/Valve and delete that Valve folder too.
6. Reboot computer in Safe Mode with Networking (spam F8 at startup screen).
7. Reinstall Steam, do not let it log in to update. Cancel it as soon as it starts Steam after install.
8. Place your steamapps folder back into the proper place.
9. Start Steam and allow it to fully update, and then install your Killing Floor.
10. Reboot normally and try again.
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