Suddenly all Steam broke down

[FoxLime]

Hello! Please help! Until recently, I played pubg and cs every day normally. But unexpectedly, when I was playing at PUBG, during the download of the match the game freezed. Alt+F4 and Alt+tab didn't help, tried ctrl+alt+del, then tried to close the application and stop processes it didn't help, all applications were "the application doesn't despond". After a while(5 minutes), all applications closed. But there were no log files about crash on the screen. Mb need to find info in log files in steam folder like GameOverlayRenderer.log? Tried to play CS, when started match, everything happened again. Did CHKDISK, no errors. What it could be?

[FoxLime]

Tried to play cs all happend again, but got problem log:
Problem signature:
Problem event name: AppHangB1
Application Name: csgo.exe
Application Version: 0.0.0.0
Application Timestamp: 5a2f1c6a
Hang Signature: c4e2
Hang Type: 2048
OS Version: 6.1.7601.2.1.0.256.1
Locale ID: 1049
Additional Hang Signature 1: c4e2ea5e37bd2a454696eb3ac7864c6f
Additional Hang Signature 2: 9977
Additional Hang Signature 3: 99777b6fa10bc36444482e3b80997b01
Additional Hang Signature 4: c4e2
Additional Hang Signature 5: c4e2ea5e37bd2a454696eb3ac7864c6f
Additional Hang Signature 6: 9977
Additional Hang Signature 7: 99777b6fa10bc36444482e3b80997b01

[FoxLime]

in compat_log.txt have
[2018-04-25 02:06:32] No local tool list detected at D:\PROGRAMMS\steam\compatibilitytools.vdf.

in connection_lox.txt
[2018-04-25 02:06:32] Log session started
[2018-04-25 02:06:32] [0,0] SetSteamID( [U:1:0] )
[2018-04-25 02:06:32] CCMInterface::OnNetworkDeviceStateChange -- Saw device up, connecting to Steam
[2018-04-25 02:06:32] CCMInterface::OnNetworkDeviceStateChange -- Saw device up, connecting to Steam
[2018-04-25 02:06:32] [0,0] LogOff()
[2018-04-25 02:06:52] [0,0] SetSteamID( [U:1:58909449] )
[2018-04-25 02:06:52] [0,0] SetSteamID( [U:1:58909449] )
[2018-04-25 02:06:52] [0,0] Server says 50% of connections should be websockets, we rolled 60 - using UDP as default.
[2018-04-25 02:06:52] [1,2] Connect() starting connection (eNetQOSLevelHigh, 155.133.242.8:27017, UDP)
[2018-04-25 02:06:53] [1,2] ConnectionCompleted() (155.133.242.9:27018, UDP)
[2018-04-25 02:07:26] [0,0] ConnectionDisconnected('I/O Operation Failed') : 'Failure' (155.133.242.9:27018, UDP)
[2018-04-25 02:07:26] [0,0] StartAutoReconnect() will start in 0 seconds
[2018-04-25 02:07:26] [0,0] Server says 50% of connections should be websockets, we rolled 60 - using UDP as default.
[2018-04-25 02:07:26] [1,10] Connect() starting connection (eNetQOSLevelHigh, 155.133.242.8:27017, UDP)
[2018-04-25 02:07:27] [1,10] ResetVoiceRecording() (was recording: 0) (last get voice time: 1524611247 seconds ago)
[2018-04-25 02:07:27] [1,10] Log session ended

in controller.txt
[2018-04-25 01:58:53] Opted-in Controller Mask: 0
[2018-04-25 01:59:01] No cached sticky mapping in GetActionSetHandle. Native Steam Controller support won't work.

in shader_log.txt
[2018-04-25 02:06:32] Attempting to find current bucket; temporary dir: D:\PROGRAMMS\steam\shader_cache_temp_dir_gl_64
[2018-04-25 02:06:32] Creating shader cache directory: D:\PROGRAMMS\steam\shader_cache_temp_dir_gl_64
[2018-04-25 02:06:32] Shader cache type 2.
[2018-04-25 02:06:32] Finding NVIDIA cache files, base directory: D:\PROGRAMMS\steam\shader_cache_temp_dir_gl_64.
[2018-04-25 02:06:32] Processing NVIDIA cache file at D:\PROGRAMMS\steam\shader_cache_temp_dir_gl_64\nvidiav1\GLCache\02ff009c7c6c807ce8e39cbde8a2b3c6\9f469866562c40a4\steamapp_shader_cache0.toc.
[2018-04-25 02:06:33] Attempting to find current bucket; temporary dir: D:\PROGRAMMS\steam\shader_cache_temp_dir_gl_32
[2018-04-25 02:06:33] Creating shader cache directory: D:\PROGRAMMS\steam\shader_cache_temp_dir_gl_32
[2018-04-25 02:06:33] Shader cache type 2.
[2018-04-25 02:06:33] Finding NVIDIA cache files, base directory: D:\PROGRAMMS\steam\shader_cache_temp_dir_gl_32.
[2018-04-25 02:06:33] Processing NVIDIA cache file at D:\PROGRAMMS\steam\shader_cache_temp_dir_gl_32\nvidiav1\GLCache\651825a14b568b8cfd3fba2df2b573c4\9f469866562c40a4\steamapp_shader_cache0.toc.
[2018-04-25 02:06:33] Found 2 current buckets:
[2018-04-25 02:06:33] 9f469866562c40a4 / 02ff009c7c6c807ce8e39cbde8a2b3c6
[2018-04-25 02:06:33] 9f469866562c40a4 / 651825a14b568b8cfd3fba2df2b573c4

stats_log.txt
[2018-04-25 02:08:11] [AppID 730] Loaded schema from disk.
[2018-04-25 02:08:11] [AppID 730] Loading stats from disk...
[2018-04-25 02:08:11] [AppID 730] Loading stats from disk...success
[2018-04-25 02:08:12] [AppID 730] CAPIJobRequestUserStats - no stats data in server response, we must be up to date

[FoxLime]

Have found solution!))
Open CMD as administrator, then bcdedit.exe /set {current} nx AlwaysOff
And restart the system, it helped, played already cs!)