Hi cashJW,
There are too many variables here to be able to give you an easy answer.
Are you using Crystal Reports by itself or with a .NET application? Either way, which version(s)?
When you are selecting a field for the report, are you able to see any results if you use the "Browse" option?
If you are specifying any Selection criteria, could it be eliminating all of the data from the report? Try running the report without any Selection criteria.