To remove the 3D Objects icon, run this command from admin Command Prompt:
reg.exe delete "HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\MyComputer\NameSpace\{0DB7E03F-FC29-4DC6-9020-FF41B59E513A}" /f
Also, see: Remove 3D Objects Folder from This PC in Windows 10 » Winhelponline
If you don't use the CD-Drive often, open Disk Management and remove the drive letter assignment for the drive.
Regarding the ReachIt Drive, the GUID is unknown as of now. Open Regedit.exe and export these two registry keys and upload the contents here.
HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\MyComputer\NameSpace
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\MyComputer\NameSpace