Sometimes if you're using OneDrive for Business, you can get two quick links in your explorer window - one is named "OneDrive" and the other is "OneDrive - Business" or something similar. They will both take you to your OneDrive library, so the duplicate can be removed. To do this involves editing the Windows Registry - so obviously you take all the responsibility for performing these activities. Please ensure you know what you are doing!
- run REGEDIT.EXE and navigate to:
HKEY_CURRENTUSER\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Desktop\NameSpace
- in that folder, you'll probably see two folders with different guids:

- Find the folder with "OneDrive" in the Data column, and delete that folder (leaving 1 folder left with "OneDrive - Business" or similar in the Data column).
That's it! Log out and back in and you should have just one Quick Link to OneDrive.