I installed everything quite a while back and had 2 XP OSs running quite nicely on separate drives. Last night I decided to add a third, and I started running into just about every (non Vista) problem discussed here, plus some new ones. Setup Latest builds of ADDS and OSS XP Home on Master , XP Pro on first partition of slave, trying to add a second XP Pro to second partition on slave. First, I discovered that the "copy" function in OSS doesn't work at all. I get the hourglass for about 30 seconds and then the program quits without any error messages. Fine, I copied my working XP Pro partition to another partition with ADDS. OSS saw the new XP install, but I got into a whole maze of editing the .oss file to allow the "Hidden" box to be checked. And I had the boot and the data for the new OS on different drives. Easier just to start from scratch. So.... I spent about 3 hours trying to upgrade to the latest builds, fighting incorrect uninstalls and missing .dlls. Now OSS and ADDS hang when analyzing the second drive. I'm currently doing a (slow) format of the second drive through Disk Management, hoping that there was something wrong that this will fix. My plan is to fire up OSS in a new, small partition on my C drive, restore (using TI 10) a clean XP pro boot drive to half of the formatted drive, drop the size down, and copy the partition with ADDS to the second half of the same drive. Will OSS see the second XP install? Do I need to worry aboutl boot.ini, MBR, and other niceties? Is there a clear how-to for doing what should be really simple? And, finally, has anyone else found it impossible to copy OSs in OSS?