Why does Browser Tuneup say I don't have Acrobat installed on my computer when I know I have Acrobat Reader? Many plug-ins require you to install the associated application onto your computer for the plug-in to work properly. Acrobat, QuickTime, RealOne and Windows Media Player are in this category. Also, while you may have the application installed, the required plug-in may be missing from your browser's plug-in folder.