Hey there folks, it looks like I may just be a little obsessive compulsive, or just anal about my drive letter structure, but for anybody else out there who may be interested, I can provide you with a solution to this matter, as a lot of searching produces not much information on this topic. It may also be that describing the situation in a Google search is not simple finding the key words on the topic. Owe-F@#king-Kay Here it is. 1: It is always best practice to install OS's (such as the Windows range) in the order they were released. That is a no brainer. 2: The original installation will need to be on an 'Active', 'Primary' partition. 3: The second installation will need to be on an 'Extended', 'Logical' partition. NOTE: This will need to be done by third party software such as Acronis's 'Disc Manager' after the first install, prior to the second install and have the newly created Extended', 'Logical' partition freshly formatted ready for the second install. My frustration is. . . Why have Microsoft, not included this type of functionality into their OS's. Don't get me wrong, I am not a Gates hater. I am an avid Windows user (Maybe for the lack of other such highly compatible OS's out there, although Mac compatibility is now becoming a major rival to Windows) Either way, I really think that Microsoft need to incorporate some new tools into the standard Disk management, even as we approach the full scale roll-out of Windows7 (which is the best so far and actually does make XP now seem very outdated in not only the shells aesthetics and feel, but also in the functionality and sheer power of the OS. Although i do feel some kind of OS-X in the aesthetics, which s similar to vista it may be, I did not Feel it with Vista, I think Microsoft can feel the rivalry and they don't like, and maybe trying to cut in on one of the major selling points of apples clearly advanced OS aesthetics, that seem to be the "average" computer users trendy new drawing point. Which is where a great deal of the sales are made, and money injected. Well that my Two-cents. Feel free to retort, or even ad to the solution that i have provided. Cheers everybody, nice doing business with you!