Please help with iastor.sys BSOD

Hello all,

I've been having frequent BSOD. Windows Debugger's message is:

BugCheck 1000007E, {ffffffffc0000005, fffff8800146327c, fffff88003dac7e8, fffff88003dac040}

Probably caused by : iaStorA.sys ( iaStorA+6127c )

This is where my computer skills ran out. I have no idea what the problem is or how to fix it.

I did try rolling back the iastor.sys driver in Device Manager to a previous version, then updating it. Didn't help.

Thanks for any help,

Anna