My task is the following: I need to have two installations of WIN XP SP2 on two different partitions with each XP not being able to see or touch the other one. Both of the XP installations should, when started up, be on the drive C:\. A third partition for data only should be created afterwards being visible for both XP Installations. I have tried this already with OSS and DDS but couldn't really get it to work. I have also tried some of the instructions on this board which were written for similar intentions. My overall problem is the following: As soon as I hide my first partition with DDS and install the second XP, the first one gets lost. Any hints are very much welcome!