LabVIEW 6.1 Installation. WIndows 98. Acrobat 4.0. When I click the Bookshelf option in the Help menu, the message box says "Opening manual "D:\LabVIEW61\LabVIEW 6.1\manuals\lvlib.pdf" ... This is the correct path. Acrobat 4.0 opens, then displays error messages "There was an error opening the document. The file does not exist." and "There was an error opening the document. The path does not exist.". However, when I open lvlib.pdf myself directly in Acrobat 4.0, it opens correctly and the index and search functions work fine.