The thing that is very strange about this problem is that I can xcopy the vmdk and other files for the image into another location on the host disk or to a attached USB disk, and start the image from there and it works fine. Even though the result of the xcopy is a working image for me, I would really like to know what the underlying problem is with the original image. It smells like an issue with the spot on the host disk that the first vmdk landed on, but, after six hours of running, CHKDSK says the whole disk is OK. Any other ideas of things to look at are appreciated. Tx!