BSOD at any user login 0X0000000A

All 4 user account get BSOD consistently right after desktop displays w/o any user input since the first BSOD on 3/31, while I was doing something? ordinary. I can login using SAFE w/Networking no problem.
Event logs don't help, nothing seems unusual. No Windows or driver updates since 3/21.
New s/w: installed syslog from Sourceforge on 3/29/13 trying to diagnose slow network SMTP & telnet connections, but syslogd does not run at startup, and is renamed/disabled now. I did have to enable superuser style Adminstrator act. to modify syslog config files due to permissions. Disabled again, but no fix there...
Note that my unlocked quad CPU has generated WHEA-Logger event 19 errors for years now.
SFC scan verifies OK.
AVG free is my virus s/w.

System Information report written at: 10/12/12 14:10:10
System Name: SANDRAS-PC
[System Summary]

Item Value
OS Name Microsoft Windows 7 Home Premium
Version 6.1.7601 Service Pack 1 Build 7601
Other OS Description Not Available
OS Manufacturer Microsoft Corporation
System Name SANDRAS-PC
System Manufacturer Gigabyte Technology Co., Ltd.
System Model GA-880GA-UD3H
System Type x64-based PC
Processor AMD Phenom(tm) II X4 B55 Processor, 3200 Mhz, 4 Core(s), 4 Logical Processor(s)
BIOS Version/Date Award Software International, Inc. FE, 3/4/2011
SMBIOS Version 2.4
Windows Directory C:\Windows
System Directory C:\Windows\system32
Boot Device \Device\HarddiskVolume1
Locale United States
Hardware Abstraction Layer Version = "6.1.7601.17514"
User Name Sandras-PC\Sandra's
Time Zone Pacific Daylight Time
Installed Physical Memory (RAM) 8.00 GB
Total Physical Memory 7.50 GB
Available Physical Memory 5.87 GB
Total Virtual Memory 15.0 GB
Available Virtual Memory 12.4 GB
Page File Space 7.50 GB
Page File C:\pagefile.sys

Code:

BugCheck A, {14, 2, 0, fffff800032ca7f0}

Probably caused by : tdx.sys ( tdx!TdxEventReceiveMessagesTransportAddress+315 )

Code:

Usual causes:  Kernel mode driver, System Service, BIOS, Windows, Virus scanner, Backup tool, compatibility

Run some hard-drive diagnostics and follow these steps:

• Hard Drive Diagnostic Procedure

Find your hard-drive manufacturer and run their tests.

Additional Tests:

• SeaTools for DOS | Seagate
• CrystalDiskInfo - Software - Crystal Dew World

Post a screenshot of Crystal Disk Info summary:

• Screenshots and Files - Upload and Post in Seven Forums

writhziden said:

If you have an SSD, make sure the following are up to date:

• SSD firmware
• BIOS Version
• Chipset Drivers
• Hard disk controller drivers/SATA drivers
• If you have a Marvell IDE ATA/ATAPI device, make sure the drivers are up to date from the Intel site or Marvell site and not from your motherboard/vendor support site.

Check for any file system errors and bad sectors using Option #2 of:

• Disk Check

Use this command with Disk Check:

Code:

chkdsk C: /f /r

Remove:

Code:

Start Menu\Programs\AVG 2011

AVG is known to cause BSODs, it's best to remove this program with the official AVG removal tools available here:AVG Removal Tool

Install and perform full scans with:

• Malwarebytes : Free anti-malware download
• Microsoft Security Essentials | Protect against viruses, spyware, and other malware

   Information

Remember to install the free version of Malwarebytes not the free trail; untick the free trial box during installation. MSE is the most lightweight and compatible with the Windows 7 operating system

You can also view this thread for a complete free and lightweight security protection combination:

• Good and Free system security combination.

Thank you, no BSOD since yesterday... fingers crossed.

Ran chkdsk first on all backup drives first, then in verbose/no fix mode on C: (more than 10 minutes
chkdsk reported an error in phase 5 in the MFT.

So I scheduled it to run with repair on reboot (as required) and rebooted at about 10:30pm. Only 10% into phase 4 at 11:20pm, so I went to bed...
This morning I am logged in & happy so far

No messages or anything in log files about the chkdsk results or repairs.

Per the system event log, it rebooted cleanly at 2:00am with no reference to a recover from previous system crash, etc. So not in SAFE mode and I was able to log in and work normally this morning: lovely!

Suppose I will never know what happened... better that than more BSODs!!!