You may try the following suggestions:
1. Try installing the latest service pack and patch for your current Data Reviewer and ArcGIS Desktop.
2. Please check if Add or Remove programs in control panel does not contain any entry of previous version release of any ArcGIS product.
Also please confirm :
1. What version of ArcGIS Desktop and Data Reviewer you are using?
2. What database are you using as your Reviewer Workspace? Is it Oracle, Sql Server, file/Personal Geodatabase or any other?