First step, DevMan, IDE ATA/ATAPI controllers, change the drivers for the Intel (also works for AMD/Nvidia - enables TRIM for SSDs and allows SSD software to access the drive for firmware updates, etc.) to the standard AHCI 1.0 Serial ATA Controller. Reboot, wait a minute or two, check with hidden devices enabled that the MS driver has 'stuck'.
Next stage, enable those hidden devices and open the Properties > Drivers tab for iaStoreA; under Startup, change the Type to Disabled - reboot, wait a few moments - if Windows prompts that you need to reboot again, it may have re-enabled it - reboot and check that iaStoreA is still disabled.
Check with Driverview that iaStoreA is now missing - if you see iaStoreF loaded, don't rename/remove it! - or you'll need to run System Restore to fix it.
As usual, always have a recent backup/image to fall back on in case something goes wrong and/or Last Known Good or System Restore does not fix it. This is only applicable to non-RAID systems.
If the problem actually lies with the iaStoreF, this probably won't fix anything, I'm just testing these things out - I've not had an issue with iaStore that I know of so I've no clue whether this will be of any real help.
EDIT: this is only on W7 - I don't have a later version to test it on.
