Sometimes Word will disable Add-ins, and you will need to re-enable the Valcre Add-in. The following steps will get it re-enabled back into Word for you:
1. Go to File -> Options
2. Click on Add-ins
3. Next to the Manage options at the bottom of the window, select Disabled Items and click Go...
4. Select Valcre in the list and click Enable
5. Then click Close and then OK
If your Datalink Add-In has disappeared after a Microsoft update and you're receiving this error (see below) when you try to re-enable Datalink, please follow the steps below: