wdkng_24:
You must of had a pretty old version of FieldPoint present on your system if you had FieldPoint 5.0 AND FieldPoint Explorer on your computer. I would suggest at this point uninstalling FieldPoint 5.0, and reinstalling it again. You can do this by going to Add Remove Programs from your Control Panel in Windows.
Just so you know, you no longer need FieldPoint Explorer. If it is installed on your system from an older install, I would just ignore it and not use it - instead use Measurement and Automation Explorer to configure your FieldPoint hardware.
To answer your other question: Yes, FieldPoint 5.0.1 will work with LabVIEW 8.0 and LabVIEW 8.20.
-Tommy