Unexpected Shutdown

Welcome aboard.

The crash dump you uploaded says you have had a BIOS error.

Code:

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*                        Bugcheck Analysis                                    *
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ACPI_BIOS_ERROR (a5)
The ACPI Bios in the system is not fully compliant with the ACPI specification.
The first value indicates where the incompatibility lies:
This bug check covers a great variety of ACPI problems.  If a kernel debugger
is attached, use "!analyze -v".  This command will analyze the precise problem,
and display whatever information is most useful for debugging the specific
error.
Arguments:
Arg1: 0000000000000003, ACPI_FAILED_MUST_SUCCEED_METHOD
    ACPI tried to run a control method while creating device extensions
    to represent the ACPI namespace, but this control method failed.
Arg2: 0000000000000000, The ACPI Object that was being run
Arg3: ffffffffc000009a, return value from the interpreter
Arg4: 0000000000000000, Name of the control method (in ULONG format)

A farther check of the BIOS says that it is old enough!

Code:

[SMBIOS Data Tables v2.6]
[DMI Version - 38]
[2.0 Calling Convention - No]
[Table Size - 2493 bytes]

[BIOS Information (Type 0) - Length 24 - Handle 0001h]
  Vendor                        Hewlett-Packard
  BIOS Version                  786G7 v01.02
  BIOS Starting Address Segment e000
  BIOS Release Date             10/22/2009
  BIOS ROM Size                 400000
  BIOS Characteristics

Better you plan for a BIOS update.

Thanks for your assist. I will update BIOS as soon as possible.

There is another pc that switched off automatically. I have attached the crash dump file to my post. Is this the same problem?

No, it is not the same problem at all ... it is STOP 0x0000010D: WDF_VIOLATION.

Code:

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*                        Bugcheck Analysis                                    *
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Use !analyze -v to get detailed debugging information.

BugCheck 10D, {5, 0, 1008, fffffa8004a74e70}

Unable to load image \SystemRoot\system32\DRIVERS\ser2pl64.sys, Win32 error 0n2
*** WARNING: Unable to verify timestamp for ser2pl64.sys
*** ERROR: Module load completed but symbols could not be loaded for ser2pl64.sys
Probably caused by : ser2pl64.sys ( ser2pl64+c267 )

Followup: MachineOwner

It is caused by ser2pl64.sys, USB-to-Serial Cable Driver/GembirdUAS112. And the driver is probably not compatible with windows 7, it is very old.

Code:

 lmvm ser2pl64
start             end                 module name
fffff880`035d6000 fffff880`035f4000   ser2pl64 T (no symbols)           
    Loaded symbol image file: ser2pl64.sys
    Image path: \SystemRoot\system32\DRIVERS\ser2pl64.sys
    Image name: ser2pl64.sys
    Timestamp:        Mon Feb 12 15:26:06 2007 (45D039B6)
    CheckSum:         0001CE8C
    ImageSize:        0001E000
    Translations:     0000.04b0 0000.04e4 0409.04b0 0409.04e4

Either update the driver, may be this is the upload location, I am not 100% sure .... Gembird Europe B.V. - Gembird Europe B.V. or change the usb to serial cable.