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Dell Inspiron 1545 - Blue screen error in Windows 7

Today, I got an error in Windows 7. It showed a blue screen with the error message 'IRQL NOT LESS OR EQUAL' then the computer restarted. After the computer restarted, the same error happened again shortly after.

After the error happened a few times, I then did a System Restore to 15/03/2017. At first, that seemed to fix the problem, but then it happened again about 2 hours later.

From what I've read online, the problem is caused by a power issue or driver error. I don't know how to find out the cause of what the problem is though.

Any advice about this would be appreciated, thanks.

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