Without any information your setup it's difficult to give you any useful advise. Assuming you are in Windows, you may want to try the following:
Run this fix from Microsoft: http://support.microsoft.com/mats/Program_Install_and_Uninstall
Uninstall Reader using Add/Remove Programs
If you want to reinstall Reader, download it from http://get.adobe.com/reader/direct/
thankyou for the info. I tried it and it worked. I did't reinstall
reader x but for some reason I can still open it on my desktop even
though in my add/remove program box???