While working on the computer your PC suddenly freezes and a blue screen pops up that shows an error of BSOD, then in this article you can find the causes of such a problem and possible fixes.
The cause of iastor.sys BSOD DRIVER_IRQL_NOT_LESS_OR_EQUAL error
In the beginning, you might get a message asking to restart you computer while you have been working on it; a blue screen may appear with an error message of 'Driver_IRQL_not_less_or_equal'
and hangs up the machine. After you restart your PC, the moment Windows starts to load the same thing happens again. This mostly happens because of an error in some of your drivers installed. To identify which drivers are infected is hard, as the 'windows' is a bit complicated software.
How to Fix iastor.sys BSOD DRIVER_IRQL_NOT_LESS_OR_EQUAL error
To resolve this you need to download some of the files from the internet. Get 'SysInternals AutoRuns' files from Microsoft website. Download this file inside the 'DOCUMENTS' folder. Then save 'Windows 7 & Vista' exe file in the same folder.
After this, make sure you are logged on as an administrative and restart your system on the safe mode by pressing F8. Get to the folder where you have downloaded the files, right click the EXE file and press 'open'. There will not be any user interaction but some windows will open and close for about ten minutes to load the files. A message will appear saying that a new folder found named 'Windows7_Vista_jcgriff2'.
Run the system health report and save the file in HTML format. This you can do by using the command prompt from the start menu: type 'perfmon / report'; a viewer will appear, from where you can save it. Restart the PC with the new settings which will resolve the issue of BSOD.