Avoiding NotSupportedException using CreateDirectory in c#

Question

I'm trying to recursively create a bunch of directories and certain directory names have ':' characters in which throws the above exception. I was hoping there may be a way to avoid this? Below is a snip of the code I'm using:

foreach (TagLib.File tagFile in tagFiles)
        {
            GetInfo(tagFile, targetDir);

            if (!Directory.Exists(TargetFullPath))
            {
                Directory.CreateDirectory(TargetFullPath);
                System.IO.File.Copy(FilePath, TargetFullPath + "\\" + tagFile.Tag.Title + TargetExt);
            } ...

Where 'TargetFullPath' = "G:\Users\Jon\Desktop\musictest\Journey\Journey: Greatest Hits"

Many Thanks :)