BSOD at random times

Honestly, I don't know if that would work. You have to have drivers in the system for whatever sata mode you are using, that is the problem. If I understand you, when you uninstalled IRST, it uninstalled everything except the raid drivers. Is that correct? If so.....

I know what I would do, but it may come to a clean install. If you are willing to accept that risk (although you could use your Acronis Image then, if you have faith that it will work) Install IRST, the whole package again. Then switch to AHCI in BIOS and it should boot. If it boots into AHCI mode a few times, we can switch to the Microsoft AHCI drivers, then uninstall all if the IRST drivers. There really shouldn't be a lot of risk in doing that. It should just put you back to where you were before uninstalling IRST, but with computers, anything is possible. Manually Create a Restore Point before you start, if you decide to try it.
System Restore Point - Create If that works, please show me a screenshot of device manager. You should have IDE ATA/ATAPI Controllers then instead of Disk Controllers.

I'm not sure exactly what you are saying, but I don't think it will take AHCI drivers when it is in raid mode. I could be wrong about that though.

Thy a newer version. There is one other option, but it is pretty dangerous. On my machine, I would try it, but I wouldn't recommend anyone else to do it. Also, I'm guessing here, but I suspect that trying to install an older version, it wouldn't install. Most drivers don't like being downgraded.

Great. That will work. At least you got rid of the buggy drivers. See how that runs for you and let us know. I hope it works well. Great job.