My PC has two harddrives, both with Windows XP Pro installed on them. I can use the BIOS Boot Popup Menu to boot into either OS but wanted to have one OS hidden when booting into the other OS. So, I bought Disk Director with the idea of using OS Selector. The problem is that OS Selector only sees one OS, the one on the Primary drive. According to Acronis, the reason is that I installed the 2nd OS having made that drive the Primary for the install. So, OS Selector will only detect OSs providing you do not install OSs the way I have. How the h**l was I supposed to know that? The blurb for OS Selector, page 79 7.2 of the manual states :- "After Acronis OS Selector is installed together with Acronis Disk Director Suite, all operating systems that exist on the PC will be automatically located and added to the boot menu" That statement is obviously not correct. Certain conditions apply that are not allowed for and should be corrected. John PS Just received an email from Acronis "We do understand your point. Our Development Team will work on Acronis OS Selector and we also will try to make our manuals more clear." That is welcome news.