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Windows 7: My PC starts by itself

05 Dec 2012   #1

Win 7 Professional 64bit
My PC starts by itself

I've got a new PC, Windows 7 Professional came pre-installed.

Now it's the second time that it has started itself while I was away. I hadn't even known that was possible!

Could that be the effect of some malware?
How can I find out what the stupid thing has been doing while it was active without me?

My System SpecsSystem Spec

05 Dec 2012   #2
Microsoft MVP

64-bit Windows 8.1 Enterprise

Hello Esha,

Oh yes, there's several things that can wake up your computer to do whatever task.

You might check your wake source log in Event Viewer to see if it may reveal what is waking up your computer.

Wake Source - Read Event Viewer Log

Hope this helps for now,
My System SpecsSystem Spec
05 Dec 2012   #3

Windows 7 Pro. 64/SP-1

Yes malware can cause this. It could be calling home. If your computer is set to sleep and a auto update kicks in could also cause it. I know of no way a program can do a cold boot. (Computer OFF)
The first place I would look is Windows Updates and see if it set to auto check for Updates. Then I would check if your anti virus is set to auto update.
If you are concerned with infection I would do this in this order.
1. Run a updated full scan with your anti virus.
2. Run a updated full scan with MAM
3. Run a updated full scan with Eset

Free Online Virus Scanner | ESET
Sorry I'm slow.
My System SpecsSystem Spec

05 Dec 2012   #4

Win7 Pro 32bit

Check all your BIOS settings thoroughly. Some - like my ASRock does in "Advanced Chipset Configuration" - have "alarm" type settings that will boot the rig up if activated.

"RTC Alarm Power On
Use this item to enable or disable RTC (Real Time Clock) to power on the system."
My System SpecsSystem Spec
05 Dec 2012   #5

Win7 Enterprise, Win7 x86 (Ult 7600), Win7 x64 Ult 7600, TechNet RTM on AMD x64 (2.8Ghz)

There are some other Bios settings, too. ReStart computer after electrical power failure, wake on modem ring, wake on Lan, etc. These can be turned ON or OFF in the Bios setup.
My System SpecsSystem Spec

 My PC starts by itself

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