It's not impossible. It is though if you think you can do it with only registry edits. After typing the instructions for almost two hours I decided to delete it all and say this instead.
The ONLY way involves several steps and cannnot be done in one sitting. After the main process you will have to watch your system for about two weeks so that you can immediately address any issues which will undoubtedly arise.
To do this you will have to have knowledge in the following:
- registry edits
- command prompt
- junctions (a.k.a. junction points; or symbolic links)
This is the area that will make you have to monitor your system for the following weeks. It is impossible to know and have memorized all the keys that are linked to the folders you wish to move because to do so would mean you have memorize the entire registry structure and all its link between every possible key.
Don't trip, all you need to know is the main ones and be willing to watch your system. You will be able to troubleshoot out the keys you missed if you write everything down, have time and patence.
You do not need to have advance skill here. What you will be doing is basically the same one line command over and over depending on how many main directories (folders) you want to move. For example: C:\Program Files is equal to one (1) time you will have to type the command yet it will move "Program Files" and all the subdirectories (everything in it). Take heed though; you will be running the commands in command prompt prior to windows booting up (requires an install or repair disc).
The junctions will also be deleted and created here but that is not the issue concerning them.
This is the part that is so mysterious and fatal to your systems successful transplant. Windows has hundreds of "symbolic links" or "junction points" (the two are interchangable) that are the foundation of its structure. Basically, though it is a little more complex, a junction is a reference to another location. A basic example is your library in windows 7 (which consists of more than one junction by the way). Watch out because there are whole directory structures that are nonexistant has they are actually a structure of junctions. An example is the C:\Users\All Users... There really is no such thing as an "All Users" Profile in Windows, it is just a structure of junctions. And of course the hidden directory C:\Documents and Settings... is the same thing.
I am not trying to scare but warn. In about two to three days after, if not sooner, you will start to get "no such interface supported" dialog box every time you try to open something! IN OTHER WORDS EVERYTHING YOU CLICK ON WILL RETURN "NO SUCH INTERFACE SUPPORTED" DIALOG BOX AND I MEAN EVERYTHING!!! This is only if you do not get all the junctions right.
On the other hand, the command prompt command is just a short one liner to delete the existing one and a just as short one liner to create the new. But you will have to type the two for about forty different junctions( ten minutes if you have a pre-made list).
If this is something you are willing to try and do, knowing that you are riskings your entire OS, please go to my profile to get my email address and hit me up. I will tell you how to get your list of junctions, the registry keys to edit, how to get into command prompt before Windows boots up, and of course the commands to use. If you listen and do exactly has instructed, you will do just fine. H-e-double hockey sticks I am about to attempt to move my user profile in Windows Home Server to another hdd myself...
Disclaimer — I am not responsible for the loss of data and/or, depending on the folders attempted to move, the loss of the entire OS of any who email me requesting instructions on how to do the aforementioned. I freely declare that I am trained with advanced skill and that I do know beyond doubt that this process is proven to work. However, it is dangerous and MUST be completed without the slightest deviation from the outlined procedure. Therefore your actions and their results are your own.