Pardon me if i may seem novice, I have been working on this problem for a while, though. I'm having a problem using the OS Selector when using 2 instances of windows XP Pro SP2 (installed using a slipstream CD) on separate primary partitions. The problem is as follows: Initially, the OS Selector only sees one instance of XP. I then tried to detect an OS on the second partition. It finds it ok. However, going back to the original OS selector screen, selecting the first instance takes me back to the regular, non-Acronis boot loader where i again have the option to choose either XP instance. If i go back to the OS selector, the second instance of XP listed takes me to an error screen. Sorry, i dont remember exactly what it said, something like "NTCRL(maybe?) cannot be found. press CTRL+ALT+DELETE to restart." I've tried 2 ways, both ending up at the same result. First I've tried installing OS Selector after I installed both windows instances. This didn't work, so I formatted the 2nd partition and tried again, while OS selector is still installed. I tried to follow the directions in the manual, however, when I get to the step where OS selector is supposed to recognize the installation after reboot, the OS selector screen just shows up as usual, showing one XP instance. I access this, and continue to the normal Windows XP setup wizard. same results. If anyone has any idea what I am doing wrong please let me know. I'm using an SATA 300GB HD, I'd appreciate any help I can get.