I hade 5.3a and it was fine after awhile it corupted and then i installed 5.3d and no change so its got nothing to do with o/s its like the hhd has bad sectors so i have even done a scan disk and help abit but not much so from experience i can bet the hdd needs a full format but i need the resourses to start from scratch and for some reason i am struggling to get that done if it was korgs services this would have been resolved in an hour from my experience