"Adobe recommends that all users of Adobe Reader 7.0 apply this update as a proactive measure. This update provides improved security and support for hyperlinks to PDF files in Microsoft Office documents. It also addresses known issues associated with form workflows and 2D barcodes. This update also addresses issues associated with viewing PDF files that contain 3D content generated in 3D CAD or modelling programs."
Acrobat can be very slow to load. One problem is the large amount of plugins which load when launched. Apparently if you resite the contents of the plugins folder in Reader to the optional folder, they continue to function when needed but not before. This speeds up initial launch.