PC auto shut down when running AV scan.

Please read this post completely before proceeding with the fix.
If you have questions, don't hesitate to ask.

First,

Click Start >> Run >> then copy paste text in codebox below

Code:

shutdown -a

then press Enter key.

Next,

Please download this file - combofix.exe by sUBs

Save it to your DesktopPlease, never rename Combofix unless instructed. Now physically disconnect from the internet and STOP all your monitoring programs (Antivirus/Antispyware, Guards and Shields) Click on your START button and choose Run. Then copy/paste the entire content of the following quotebox (Including the "" marks and the Symbols) into the run box.




"%userprofile%\desktop\ComboFix.exe" /KillAll


Click OK and this will start ComboFix in a special way. When finished, it will produce a log. Please save that log to a Notepad File to post in your next reply along with a fresh HJT log.

Note:
Do not mouse-click combofix's window while it is running. That may cause it to stall.

* After you have saved the logs, restart your system to re-enable all the programs that were disabled during the running of ComboFix.

* Reconnect to the internet

* Post the following logs/Reports:

ComboFix.txt Fresh HijackThis log run after all the other tools have performed their cleanup.

Ok... Let's check your system again.

Next,

Please download Malwarebytes' Anti-Malware from Here or Here

Double Click mbam-setup.exe to install the application.

• Make sure a checkmark is placed next to Update Malwarebytes' Anti-Malware and Launch Malwarebytes' Anti-Malware, then click Finish.
• If an update is found, it will download and install the latest version.
• Once the program has loaded, select "Perform Quick Scan", then click Scan.
• The scan may take some time to finish,so please be patient.
• When the scan is complete, click OK, then Show Results to view the results.
• Make sure that everything is checked, and click Remove Selected.
• When disinfection is completed, a log will open in Notepad and you may be prompted to Restart.(See Extra Note)
• The log is automatically saved by MBAM and can be viewed by clicking the Logs tab in MBAM.
• Copy&Paste the entire report in your next reply.

Extra Note:
If MBAM encounters a file that is difficult to remove,you will be presented with 1 of 2 prompts,click OK to either and let MBAM proceed with the disinfection process,if asked to restart the computer,please do so immediatly.

Next,

Download and scan with SUPERAntiSpyware Free for Home Users

• Double-click SUPERAntiSpyware.exe and use the default settings for installation.
• An icon will be created on your desktop. Double-click that icon to launch the program.
• If asked to update the program definitions, click "Yes". If not, update the definitions before scanning by selecting "Check for Updates". (If you encounter any problems while downloading the updates, manually download and unzip them from here.)
• Under "Configuration and Preferences", click the Preferences button.
• Click the Scanning Control tab.
• Under Scanner Options make sure the following are checked (leave all others unchecked):
  • Close browsers before scanning.
  • Scan for tracking cookies.
  • Terminate memory threats before quarantining.
• Click the "Close" button to leave the control center screen.
• Back on the main screen, under "Scan for Harmful Software" click Scan your computer.
• On the left, make sure you check C:\Fixed Drive.
• On the right, under "Complete Scan", choose Perform Complete Scan.
• Click "Next" to start the scan. Please be patient while it scans your computer.
• After the scan is complete, a Scan Summary box will appear with potentially harmful items that were detected. Click "OK".
• Make sure everything has a checkmark next to it and click "Next".
• A notification will appear that "Quarantine and Removal is Complete". Click "OK" and then click the "Finish" button to return to the main menu.
• If asked if you want to reboot, click "Yes".
• To retrieve the removal information after reboot, launch SUPERAntispyware again.
  • Click Preferences, then click the Statistics/Logs tab.
  • Under Scanner Logs, double-click SUPERAntiSpyware Scan Log.
  • If there are several logs, click the current dated log and press View log. A text file will open in your default text editor.
  • Please copy and paste the Scan Log results in your next reply.
• Click Close to exit the program.

Finally,

Please download Deckard's System Scanner (DSS) and save it to your Desktop.

• Close all other windows before proceeding.
• Double-click on dss.exe and follow the prompts.
• When it has finished, dss will open two Notepads main.txt and extra.txt -- please copy (CTRL+A and then CTRL+C) and paste (CTRL+V) the contents of main.txt and extra.txt in your next reply.

Post back with the following logs.

- MBAM log
- SuperAntispyware log
- DSS logs