TIA for your help on this issue: Here is the short version: I needed 2 XP installs on different partions: one for Office and graphic work, the other for Video and Music work. Here is what I did: 1) I Partitioned C drive (XP Pro) 2) Installed Acronis Boot Manager 3) Installed another XP Pro on new Partition (G) from Win XP Pro CD 4) After reboot, Original XP will not boot (missing System32\hal.dll) 5) New XP install works but when I go the C Drive "C:\Document and Settings", "C:\Program Files", "C:\Win32", and other folders belonging to original XP installation on C drive are present, but empty (Zero K) Here is the long story: I wanted to set up a Dual XP boot system. I work in high end graphics, 3D, animation and such, but I also work in video editing and music composition. Each specialty uses a ton of resources and dedicated hardware and software configurations. I tried setting up different profiles within XP but it was cumbersome, so I decided to set up a dual boot of XP Pro: One for Graphic works and regular office work, network, Internet and email and one for Video and music work with only the programs and hardware needed for the task. My original set up was 2 disk drives: C:/ and E:/, the C drive contained the OS but the E drive contained the "My Documents" folder, "My Pictures", My Videos etc. I did that with Tweak UI if I recall. Yesterday I partitioned my C drive and created a new bootable partition. I also installed Acronis Boot manager. I proceeded to install XP pro into the new partition (let's call it G:/) and after the installation I restarted. At first I didn't think anything was wrong, but when I went to restart the computer the first thing I noticed was that Acronis OS selector was not active. All I had was the usual boot screen with 2 choices of xp. The upper one is the new XP Pro install on the G drive, the lower one I is the old XP Pro install on C Drive. When I tried to start from the original XP installation (C Drive) the system told me that I was missing HAL.DLL (system32/hal.dll). I started the new XP OS (the one I am writing from) to go look for my system files and I discovered that the old XP OS on my C drive had practically disappeared: All the necessary folders are there, but there are no files inside the C:\Document and Settings folder, nor there are any inside the C:\Program Files. My Win32 folder only contains another folder called Photoshop and the C:\Windows folder is empty as well. I am not talking invisible files here. I set up the new OS to show all the invisible and system files and the size of these folders is "0 kb". Thank God I did not keep "My Documents" in the usual place or it would have disappeared the same way everything else has in the Document and Setting Folder on the C drive (including the My documents for the Administrator on the old XP OS). I searched for the HAL.DLL fix and I found several fixes, but I have a feeling that HAL.DLL is just the first of many missing files. Fortunately, I have several backups of my files and I have a Ghost file of the OS only a few months old. The only important issue, beside the pain in the neck of having to reinstall all my programs, drivers and pheripherals, would be my Outlook eMail. I had some important correspondence there that I have not backed up in a while. The ideal solution would be to restore the old XP install, but I am weary of touching my C drive and risk overwriting important files. My best guess is that the files are still there (How could a fresh install on a different partition have deleted them?) but they have become invisible along with all the system files. Does anyone know what went on here? And more importantly, does anyone have a fix for this? I had never used the Acronis Boot manager before, but I have used the Partition manager and I think the Acronis Suite is the best on the market. I have a feeling that this is not Acronis fault. TIA for your kind help, I hope others have encountered this problem and can help me fix it.