my computer reboots unespectedly

here is bug report

- System

    - Provider       [ Name] Microsoft-Windows-Kernel-Power       [ Guid] {331C3B3A-2005-44C2-AC5E-77220C37D6B4}       EventID 41       Version 3       Level 1       Task 63       Opcode 0       Keywords 0x8000000000000002     - TimeCreated       [ SystemTime] 2015-07-21T18:04:23.558108600Z       EventRecordID 858       Correlation     - Execution       [ ProcessID] 4       [ ThreadID] 8       Channel System       Computer bilgisayar     - Security       [ UserID] S-1-5-18

- EventData

    BugcheckCode 126     BugcheckParameter1 0xffffffffc0000005     BugcheckParameter2 0xfffff800bf77113b     BugcheckParameter3 0xffffd001f77631b8     BugcheckParameter4 0xffffd001f77629c0     SleepInProgress 0     PowerButtonTimestamp 0     BootAppStatus 0

Hi,

For this event,  you can check this KB article:

Windows Kernel event ID 41 error "The system has rebooted without cleanly shutting down first" in Windows 8.1, Windows 8, Windows Server 2012 R2, Windows Server 2012, Windows 7, or Windows Server 2008 R2

https://support.microsoft.com/en-us/kb/2028504

To further troubleshoot this issue, please post back your minidump file here for our research.

Please upload them to a file sharing service like Onedrive or "Rapidshare" and put a link to them in your reply.
Link for how to  upload below.
http://www.wikihow.com/Use-SkyDrive 
To ensure minidumps are enabled, refer to the step Configure the dump type in following article:
How to read the small memory dump file that is created by Windows if a crash occurs
http://support.microsoft.com/kb/315263#method2