Hi @Anonymous,
Thanks for contacting Autodesk Community..
I have faced the similar issue at my end while opening the tool database in Autodesk PowerMill 2018. Following Steps helped me to resolve the issue-
1. Close all active sessions of Autodesk PowerMill 2018.
2. Download and Install the version of the Microsoft VC C++ 2005 from the following link –
https://autodesk.box.com/s/alnhcyov5dvxm3s40yysqafqphm1xujt
3. Restart the system.
4. Now browse to
"C:\Program Files\Autodesk\PowerMill 2018\sys\tooldb"
There you will find an application called "ADODC.exe"

5. Right Click on this and tell it to create a shortcut. Windows will typically tell you to place this on the desktop.
6. Locate the shortcut on your desktop or where ever you placed it. Right click on the shortcut and select properties. In the target line you will see the path as-
"C:\Program Files\Autodesk\PowerMill 2018\sys\tooldb\ADODC.exe"

Modify this path to -
"C:\Program Files\Autodesk\PowerMill 2018\sys\tooldb\ADODC.exe" -Regserver

7. Once you have modified this select OK then run the short cut.
Now Open Autodesk PowerMill 2018 and retry accessing the tool database.
Hope this resolves the issue accessing tool database at your end.
If this procedure resolves your query then please click on 'Accept as solution' for this post.
Thank you for your time and co-operation.
Best regards,
Jitendra Chaudhari.