A) with help from this forum i made it through the HD not found E000101F4 error on a brand new HP core 2 duo notebook with a sata HD. Thank you B) I worked as much as possible as suggested by MudCrab in https://www.wilderssecurity.com/showthread.php?t=192957: to create a dual boot XP / VISTA 1)Boot to the DD CD. 2)Use DD to clear the drive (remove all partitions). I KEPT THE SELF-INSTALLING PARTITION FOR VISTA, SINCE I DO NOT HAVE A VISTA DVD 3) Decide where you want the small OSS partition (before or after the other partitions). I'm going to put it at the end in this example. YES 4) Create the partition for Vista - Primary NTFS I FIGURED THE SELF-INSTALLING PARTITION FOR VISTA WOULD CREATE A VISTA PARTITION. IT DID NOT. IT INCREASED ITS SIZE WITH THE AVAILABLE UNALLOCATED SPACE 5) Create the partition for XP - Primary NTFS YES 6) Label the partition XP YES 7) Create the partition for OSS - Primary FAT32 or NTFS, 100MB YES Label the partition OSS YES 9) Set the Vista partition Active NO, DID NOT CREATE THIS PARTITION Set the XP partition Hidden YES MY SETUP IS NOW AS FOLLOWS: 1° THE SELF-INSTALLING PARTITION FOR VISTA 2° UNALLOCATED SPACE (ABOUT 30Gb) 3° XP PARTITION 4° OSS PARTITION 10)Exit DD and let it reboot back to the Acronic CD menu Insert the Vista DVD and reboot HERE, I LET THE SELF-INSTALLING PARTITION FOR VISTA DO ITS WORK: IT INSTALLED VISTA Install Vista, select the Vista partition as the destination 11) After Vista is installed, Vista should be C: and the OSS partition should have a drive letter. YES, VISTA ON C, OSS PARTITION = D 12) Install DD in Vista YES 13) Install OSS in Vista - select the Custom install option and select the OSS partition as the destination for the OSS files. YES 14) Reboot and make sure OSS finds Vista (it should) and boots okay into Vista (it should). HERE IT WENT WRONG, OSS CAN'T FIND THE VISTA BOOT SECTOR: NOT IN THE PARTITION, WHICH IS PRIMARY AND ACTIVE, NOT IN THE MBR. IT SUGGESTS TO LOOK FOR THE BOOT SECTOR IN A FILE NAME. I HAVE NO CLUE AS TO WHAT FILE THAT WOULD BE ?? I WENT AHEAD TO DEACTIVATE OSS, ONLY TO FIND THAT THIS WAS NOT POSSIBLE: "no OS's were found on your computer. OSS deactivation cannot proceed" !! Luckily I was able to reboot with the DD CD and deactivate OSS there... Any suggestions on how to make OSS find my OEM VISTA are more than welcome. I would very much like to keep VISTA for future use and "downgrade" to XP on another partition ... and ACRONIS, DO YOU READ ?? .... this seems to be a well know problem with your software !