Bsod irql_not_less_or_equal

jaysontan said:

I've notice that GPU temp went 60c while idling

That is normal. :)

What is the situation after re-applying thermal paste?

jaysontan said:

Unfortunately, it will auto restart while playing DoTa 2 or watching Youtube seldom and it takes a few time for me to power on it after it restarts.

Next time, when the auto restart will take place, upload the data as per BSOD posting instructions? May be we can get something from the logs.

Event[34824]:
Log Name: System
Source: Application Popup
Date: 2014-04-16T11:19:56.136
Event ID: 1060
Task: N/A
Level: Error
Opcode: N/A
Keyword: Classic
User: N/A
User Name: N/A
Computer: Liang-PC
Description:
\??\C:\Windows\SysWow64\drivers\360netmon.sys has been blocked from loading due to incompatibility with this system. Please contact your software vendor for a compatible version of the driver.

So it appears that the 360 antivirus is incompatible.

Uninstall it. Apply any other good antivirus. I recommend Microsoft Security Essentials as your antivirus with windows inbuilt firewall, and free MBAM as the on demand scanner.

Download, install and update those, and then run full system scans with both of them, one by one; as the installed antivirus failed.

Check if the Power Supply Unit (PSU) supplying adequate power to the computer or not.
eXtreme Power Supply Calculator
Also let us know the wattage of the PSU.