Steam Technical Issues
There is a problem in the interaction of Windows 10 and steam. It appeared on build 9926, and earlier all works fine. I have 2 hard drives on my laptop, Windows 10 Technical Preview on disk 'C' and Windows 8.1 on disk 'E'. When I run Windows 10 and run game Insurgency in Steam after 1-10 min steam crashes and game freezes. If I run steam as administrator, it displays an error 'Steam Client Bootstrapper has stopped working.'
Apple Technical Issues
, but if I run Windows 8.1 and run Steam that installed on disk 'C'(the same files) all works fine. Two my friends have the same problem. Dota2 works correct. I tried run Steam, SteamService and Insurgency in compatibility mode for Windows 8, Windows 7 and run them as administrator, but the problem still occurs.

Technical Issue Email
Sorry for my English).
There is a problem in the interaction of Windows 10 and steam. It appeared on build 9926, and earlier all works fine. I have 2 hard drives on my laptop, Windows 10 Technical Preview on disk 'C' and Windows 8.1 on disk 'E'.
When I run Windows 10 and run game Insurgency in Steam after 1-10 min steam crashes and game freezes. If I run steam as administrator, it displays an error 'Steam Client Bootstrapper has stopped working.' , but if I run Windows 8.1 and run Steam that installed on disk 'C'(the same files) all works fine.
Two my friends have the same problem. Dota2 works correct. I tried run Steam, SteamService and Insurgency in compatibility mode for Windows 8, Windows 7 and run them as administrator, but the problem still occurs. Sorry for my English).