|driver_irql_not_less_or_equal windows 7|
Get the latest driver, get from their hardware manufacturer if possible, wrong or out of date driver can lead to this error.
Install Service Pack
Service pack is a bunch of patches produced by Microsoft, by updating or install service pack will eliminate lots of problem including this error.
Bad page file
Bad or corrupt page file can be causing this error, delete and re-create your page file. Page file is created automatically when running a program. When RAM is not enough to run a program system will create page file or swap file to read tempory data between this file and RAM.
Replace Memory (Bad RAM)
Bad or broken RAM can be causing this error if you have more than one piece of physical RAM, remove one by one until one left to check whether the problem sorted.