Security App
Code:
avgidsdrivera.sys Fri Mar 29 07:40:56 2013 (5154F128)
avgidsha.sys Fri Feb 8 09:14:48 2013 (51146DA8)
avgldx64.sys Fri Feb 8 09:14:24 2013 (51146D90)
avgloga.sys Fri Feb 8 09:14:29 2013 (51146D95)
avgmfx64.sys Fri Feb 8 09:14:48 2013 (51146DA8)
avgrkx64.sys Fri Feb 8 09:14:05 2013 (51146D7D)
avgtdia.sys Thu Mar 21 07:50:47 2013 (514A6777)
Crashes indicate AVG being a possible cause. Remove AVG and replace with Microsoft Security Essentials to see if it provides more stability. 
Uninstallers (removal tools) for common antivirus software
Microsoft Security Essentials and Malwarebytes are recommended from a strict BSOD perspective. They do not cause blue screens on the system as other AV products do.
Microsoft Security Essentials for Windows
MalwareBytes Free
Overclocking
If you are overclocking any hardware, STOP. Reset any changed values back to default.
Tip
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.
Thanks to Writhziden for the steps above.
Disk Check
For errors on your Hard drive(s): Disk Check
Is the firmware for your SSD up-to-date?
Check for one and see if the stability returns.
Memtest86+
Run Memtest86+ for at least 8-10 passes. It may take up to 20 passes to find problems. Make sure to run it once after the system has been on for a few hours and is warm, and then also run it again when the system has been off for a few hours and is cold.
How to test and diagnose RAM issues with Memtest86+
Note
Pay close attention to part 3 of the tutorial in order to rule the faulty RAM stick out.
Tip
Do this test overnight.
BSOD BUGCHECK SUMMARY
Code:
Debug session time: Sat Jul 6 22:19:32.479 2013 (UTC + 6:00)
Built by: 7601.18113.amd64fre.win7sp1_gdr.130318-1533
System Uptime: 0 days 0:39:24.666
Probably caused by : memory_corruption ( nt!MiPfnShareCountIsZero+77 )
BugCheck A, {2a80011fd97a, 2, 0, fffff8000349ad67}
BugCheck Info: IRQL_NOT_LESS_OR_EQUAL (a)
Bugcheck code 0000000A
Arguments:
Arg1: 00002a80011fd97a, memory referenced
Arg2: 0000000000000002, IRQL
Arg3: 0000000000000000, bitfield :
bit 0 : value 0 = read operation, 1 = write operation
bit 3 : value 0 = not an execute operation, 1 = execute operation (only on chips which support this level of status)
Arg4: fffff8000349ad67, address which referenced memory
BUGCHECK_STR: 0xA
DEFAULT_BUCKET_ID: WIN7_DRIVER_FAULT
PROCESS_NAME: avgcsrva.exe
FAILURE_BUCKET_ID: X64_0xA_nt!MiPfnShareCountIsZero+77
MaxSpeed: 3400
CurrentSpeed: 3400
BiosVersion = F4
BiosReleaseDate = 05/16/2013
SystemManufacturer = Gigabyte Technology Co., Ltd.
SystemProductName = Z87-D3HP
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Debug session time: Sat Jul 6 21:08:41.613 2013 (UTC + 6:00)
Built by: 7601.18113.amd64fre.win7sp1_gdr.130318-1533
System Uptime: 0 days 2:01:01.800
Probably caused by : memory_corruption ( nt!MiAgeWorkingSet+425 )
BugCheck 50, {fffffa80c72d801b, 0, fffff800034687bf, 5}
BugCheck Info: PAGE_FAULT_IN_NONPAGED_AREA (50)
Bugcheck code 00000050
Arguments:
Arg1: fffffa80c72d801b, memory referenced.
Arg2: 0000000000000000, value 0 = read operation, 1 = write operation.
Arg3: fffff800034687bf, If non-zero, the instruction address which referenced the bad memory
address.
Arg4: 0000000000000005, (reserved)
BUGCHECK_STR: 0x50
DEFAULT_BUCKET_ID: WIN7_DRIVER_FAULT
PROCESS_NAME: System
FAILURE_BUCKET_ID: X64_0x50_nt!MiAgeWorkingSet+425
MaxSpeed: 3400
CurrentSpeed: 3392
BiosVersion = F4
BiosReleaseDate = 05/16/2013
SystemManufacturer = Gigabyte Technology Co., Ltd.
SystemProductName = Z87-D3HP
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Quote
Do not start the free trial of MalwareBytes, unselect that option when prompted.
Update and make full scans with both separately.