How to fix 0xc000021a, BSOD?

Code:

0xC000021A:    WINLOGON_FATAL_ERROR (12.02.2017 13:07:02) [Windows 10] 
 
CAUSED BY:     memory_corruption    
 
PROCESS:       smss.exe 
 
Usual causes:  User-mode device driver, system service, or third-party application, Mismatched system files

1: kd> da ffffb6096886a5d0
ffffb609`6886a5d0  "initial session process or"
1: kd> db ffffb6096886a5d0
ffffb609`6886a5d0  69 6e 69 74 69 61 6c 20-73 65 73 73 69 6f 6e 20  initial session 
ffffb609`6886a5e0  70 72 6f 63 65 73 73 20-6f 72 00 00 00 00 00 00  process or......
ffffb609`6886a5f0  03 03 04 03 4d 6d 53 6d-00 00 00 00 00 00 00 00  ....MmSm........
ffffb609`6886a600  20 79 7b 20 0e a1 ff ff-03 00 00 00 00 00 0c 00   y{ ............
ffffb609`6886a610  00 00 00 00 00 00 00 00-8c 22 00 00 00 00 00 00  ........."......
ffffb609`6886a620  00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00  ................
ffffb609`6886a630  04 03 17 03 4d 50 73 63-00 00 00 00 00 00 00 00  ....MPsc........
ffffb609`6886a640  00 00 00 00 00 00 00 00-00 5b 9b 1b 0e a1 ff ff  .........[......

1: kd> da ffffb6096886a5d0
ffffb609`6886a5d0  "initial session process or"

maybe someone can interpret this.

BSODHunter said:

Code:

0xC000021A:    WINLOGON_FATAL_ERROR (12.02.2017 13:07:02) [Windows 10] 
 
CAUSED BY:     memory_corruption    
 
PROCESS:       smss.exe 
 
Usual causes:  User-mode device driver, system service, or third-party application, Mismatched system files

It says usual causes are drivers or mismatched system files right since memtest+ gave 11passes with zero error[18 hours].
What should I do now?
Also how can both ram be damaged.
PC works perfectly when I disable driver signature enforcement. And Live usb OSs is correctly working . Why?

Code:

initial session process or

I already got that in atleast 30 minidumps but no details on web.
Pls advise.

BSODHunter said:

Code:

0xC000021A:    WINLOGON_FATAL_ERROR (12.02.2017 13:07:02) [Windows 10] 
 
CAUSED BY:     memory_corruption    
 
PROCESS:       smss.exe 
 
Usual causes:  User-mode device driver, system service, or third-party application, Mismatched system files

1: kd> da ffffb6096886a5d0
ffffb609`6886a5d0  "initial session process or"
1: kd> db ffffb6096886a5d0
ffffb609`6886a5d0  69 6e 69 74 69 61 6c 20-73 65 73 73 69 6f 6e 20  initial session 
ffffb609`6886a5e0  70 72 6f 63 65 73 73 20-6f 72 00 00 00 00 00 00  process or......
ffffb609`6886a5f0  03 03 04 03 4d 6d 53 6d-00 00 00 00 00 00 00 00  ....MmSm........
ffffb609`6886a600  20 79 7b 20 0e a1 ff ff-03 00 00 00 00 00 0c 00   y{ ............
ffffb609`6886a610  00 00 00 00 00 00 00 00-8c 22 00 00 00 00 00 00  ........."......
ffffb609`6886a620  00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00  ................
ffffb609`6886a630  04 03 17 03 4d 50 73 63-00 00 00 00 00 00 00 00  ....MPsc........
ffffb609`6886a640  00 00 00 00 00 00 00 00-00 5b 9b 1b 0e a1 ff ff  .........[......

1: kd> da ffffb6096886a5d0
ffffb609`6886a5d0  "initial session process or"

maybe someone can interpret this.

You may want to read my blog post, it explains a few things about smss.exe and may help you to understand it.
0x21A Analysis - BSOD Analysis

Currently I have reasons to believe that your HDD may be the cause of the issue, it would at least explain why you're able to run live operating systems.

How old is your hardware?
If it isn't too old, like not older than a few years, many things to repair the boot stuff won't work as they are meant for the old generation of booting.

Have you performed any tests on your HDD?

Diagnostics Test

 HDD TEST

   Note

Please run HDTune first, in the order posted!

Run HDTune to

• check the health,
• scan for errors, no quick scan but full scan
• run a benchmark.

It may take some time, but please take the time you need to perform it properly.
When above is done please make screenshots of the following

• the health,
• the error scan,
• the benchmark incl. following
  
  • transfer rate,
  • access time,
  • burst rate,
  • cpu usage.

Run SeaTools DOS to check the integrity of your HDD. SeaTools for DOS and Windows - How to Use - Windows 7 Help Forums
Run the long test.

   Note

Do not run SeaTools on an SSD as the results will be invalid.

Make a photo of the result and post it.

Run chkdsk
Disk Check - Windows 7 Help Forums
Use option TWO with parameter /r
Upload the chkdsk log Check Disk (chkdsk) - Read Event Viewer Log - Windows 7 Help Forums

The system reserved partition is normally not visible to the user, because it contains important files. If I remember correctly, this partition is used for the recovery and/or boot process.

That this partition is visible means that your partitioning is screwed up more than I had hoped. (It also means that your system is using the old generation of booting)
There may be a chance that the partitioning problem may be fixed, but if you'd like to get it fixed without a clean install then we'll need someone who is more experienced in this than I am in this.