Upgrading to XP SP3 broke my laptop, now the HD isn't even recognized when trying to remove SP3/repair SP2. I've read that upgrade does that with that laptop, somehow modifying the HD so Windows thinks it's something else, while BIOS sees it okay. I can read/write to the HD by putting it in an external case w/USB. I need to fix the disk from this other laptop (it won't fit inside - so it's external). The working laptop is SP3. I don't want to miss up the working laptop, or delete any non-o/s data files on the disk being reverted to SP2. I have an XP SP1 boot disk, and the SP2 non-boot upgrade. Thanks for any help. (BTW - I *don't* want to get into the "unbelievability" of Windows not seeing the disk - rather just repairing the disk (boot record, O/S, etc.) from the other laptop.) Thanks.