Frequent BSODs

[DenOpvolger]

Last days I get a lot of BSODs, mostly saying: irql_not_less_or_equal.

I have an Acer Aspire 8920G with Windows 7 Professional.

 

[DenOpvolger]

I've already run Malwarebyte's anti malware, but this didn't fix te problem.
The Memtest86 program didn't help either.

Is there anyone who can help me please?