A few days ago I was having trouble deleting a non-working file (Zonealarm exe file) because it had the attribute "read-only". This attribute was "grayed out" so I couldn't change it. I then noticed that ALL the files and folders in my C drive were the same way (don't know how that happened). I went to the C drive folder (toshiba satellite laptop running XP pro, SP3+) and looked in properties/security and after trying a few things that didn't work, I changed the user permissions to full control thinking this could undo the read only status. Then in the advanced panel I checked the box called "Inherit from parent the permission entries that apply to child objects. Include these with entries explicitly defined here", expecting that to propagate the new full contrrol permissions to all files/folders in C drive. After the system "searched" (and changed) many files, it stopped. I checked the file I wanted to delete - and it was STILL grayed out read-only. Thought maybe I needed to reboot, so I did that -- then everything got worse! My XP wouldn't even boot. BSOD saying "autochk program not found... STOP: fatal sys error 0xC0000022". From web searches on that code, looks like the crash is caused by a permission problem. (That figures) Next I'll pull the HD from my XP machine, and using an HD to USB adapter (ordered one which should arrive on Monday), plug it into my Vista laptop. From there I should be able to explore the XP drive and HOPEFULLY fix the screwed up permissions. That's what I need help with. I don't understand why what I did before with the permissions screwed things up. Anyone understand what happened?? And I'm not sure if adding the XP HD to the vista machine will even allow me to play with the permissions. How should I proceed?? (I need to get my XP machine out of its endless boot loop, and to get my files out of read only status.) Thnaks, Jack PS - Booting the XP machine in DOS shows me that the directory structure on the HD is still intact. So I assume there's nothing really wrong with the drive itself. I have no idea if I can change permissions from DOS.