Do you mean that whatever\Steam\SteamApps\common\ is almost empty ?
that's quite strange :O
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http://forums.steampowered.com/forums/showthread.php?t=2900691
Else maybe bad hdd?
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If you have Win 10, there is an update that reorganizes your computer such as turning on privacy settings that were turned off by you and even uninstall certain programs.
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Here is information
Check if you have Windows 10 Version 1511
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if you had a lot of racing games Formula 1 racing cracked down a lot on trademark and texture piracy which caused some games with pirated F1 content to be removed from steam
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I had maybe 50 games installed, and I just turned on my computer and now there are only 12. Any ideas of what might have happened????
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