Hi Darro5316,
Click the Start button and then click 'Default Programs' (this you will find on the right of the menu under the Control Panel option.) When the default programs winodw opens, Click the 'associate a file type or protocol with a program' option. The Set Associations window will now open, but may be slow to populate. Once it has populated scroll down to the .pdf file and make sure that it is associated with Adobe Acrobat or Adobe Acrobat reader (depending upon which you have installed on your system). If it says that it is associated with Media Player, then Click the 'change program' button and see if Adobe Acrobat or Adobe Acrobat Reader is available in the list. If it is then select it and then click the OK button. If Adobe Acrobate or Adobe Acrobat reader isn't available then click the browse button, locate Acrobate or Adobe Reader and then associate the file with the program.
John Barnett MVP: Windows XP Associate Expert: Windows Desktop Experience: Web: http://www.winuser.co.uk; Web: http://xphelpandsupport.mvps.org; Web: http://vistasupport.mvps.org;