I am going to "Upgrade" my computer, which means, a new mb, processor, disk drive, memory, and video card. I will use my old case and power supply, and, maybe, some of the old hard drives. As well as the external stuff, of course. I have a bunch of licensed software that I want to use on the new computer. I can use Acronis True Image to make a copy of my current disk on the new disk. The problem is the operating system. I am going on the assumption that XP is smart enough to know that this is an all-new computer, i.e. too many "points" of change, and will not let my original oem version of XP Pro proceed. Question #1: What will happen if this happens? Will it boot but not run or what? Question #2: Suppose I buy a new copy of XP Pro, can I install it over the old XP Pro? If so, can I use an Upgrade version to upgrade XP Pro to XP Pro? (The advantage of the Upgrade version is that it should be legally tranferable to a new system if I choose, whereas the oem version may not be - at least that is the conclusion I came to when we had this discussion some months ago. If the oem version were transferable, then I would not be having this problem. However, since Vista is coming out, it is unlikely that I will be doing such a transfer.) I may well build a "new" computer using the old stuff, so I don't mind buying a new copy of XP. The old XP can be used on the new computer. The issue is my upgrade. I would much prefer a clean install, but I have a half-dozen pieces of software that would be a hassle to get reauthorized. I may end up doing a clean install anyway, especially if the answers to the questions above prove discouraging. Dean Kukral The NOSPIN Group has added a new feature on our website, web based bulletinboard for questions and answers: Visit our sister website at http://nospin.com