I know this is a very old thread, but I was having this problem earlier, and found a solution, so thought maybe someone else might eventually google this. I feel like multiple things could cause that error, so I have no clue if this is what was going on with bobbin, but here's what was going on in my case: the exe and dll files were not writable as they were being held by some other process. MusicBee was closed so I didn't think about that initially, and didn't have any idea what process could be holding the files. I also did not have the option to run as administrator in this case.
It seems Win 10 (and Win 7 and Win 8 .) have something built in called Resource Monitor, which will help you identify and kill the process in question. (Just click the start menu button and start typing Resource Monitor). If you open Resource Monitor, click the 'CPU' tab, and then type 'MusicBee' in the handles search, it'll show you what's holding the process. You can then kill the process. once I did that, I had permissions to open those files for writing.
See this one where it's called 'mutant' - that's the process that was holding on to the exe, and making it non-writable. I killed this process and was able to install MusicBee after that. I'm not sure what this process is all about, or what \Sessions is, maybe someone with more experience in Windows would have an idea. I had tried to apply a patch of MusicBee just prior to this, and I'm assuming that's what the mutant exe is, and what probably caused all this. I do not think I could successfully uninstall MusicBee either (for the purpose of re-installing), until this was resolved. HOpe this helps someone one day..