Mike,of course you should be able to, and simply, and I am not sure how you managed to foul it up. :)
The first job is to attempt to recover any file you have lost in the process, and this free pgm will make a fairly decent go of that: gurgle for and dl...
REST2514.EXE - best is if you use another computer to dl it, and dl it to a removable medium such as a floppy or USB flashdrive from which you then run it [this avoids the creation of temp internet files etc which may overwrite your lost data]. Failing that, just dl it to your hdd and run it from there.
Dclick that exe to run it.
The other job simply involves creating a folder set as you go that reflects what you want to do. Explorer almost presents the actual physical drives as "invisible", showing them as merely part of the whole folder structure.
COPY your data over; "Moving" files involves the simultaneous deletion of the parent files... you may not wish to risk that?
As a further step it is possible to move across all the pgm and system temporary, application and data files, and inform the system about where they are so that data is no longer written to your C: drive, but I'm not too sure that you are ready for that...