I am running Win 7 Ultimate 64 bit which has been remarkably stable for more than 4 years. I added a new HGST 8tb He drive to replace an HGST 5 tb drive that was making loud noises. I installed DrivePool (I believe the 561 version) at that time (about six months ago). All was quite well until DrivePool app said there was a new version, downloaded it and installed. The next day the computer blue screened with Page Fault in non paged area 0x000000050 error. I rebooted and watched for several days, and found that each time an application tried to access the drivepool using its assigned letter (q:), the blue screen results. It does not happen if I access the same directories using the real disk's letter (k:). This is the only physical drive n the pool at the moment.
If I recall, Drivepool itself installed version.850 when it found the newer version. As part of my own attempt to fix this I installed the .852 version to see if the problem was fixed. It is not.
I have memtested the machine, and double-checked all SATA connections, and believe the bluescreen originates from the newer versions of DrivePool. Please help and let me know what other information you need from me. Thanks!