"tmp.drivedownload" Error - unable to resolve with tech support escalation

Thanks, Jay, I did manage to delete it however it was not Dropbox that was stopping the process, it was Google Drive that was making it impossible have no idea why! I cannot understand how Google Drive put the folder in there in the first place then took control of it. I was thinking like yourself if Dropbox is finished syncing I should be able to delete it, however, I had to stop Google Drive to delete it. All worked in the end! All those pop-up messages also turned out to be saving files in that folder too which is why the folder was getting bigger and bigger and nothing got accidentally deleted. :)