There can be many reasons why you are not able to open pdf.Probably your pdf files are corrupt.If you are facing this problem with all the pdf files then it implies your Reader 932 is corrupt.In that case do the following to to reach 934(latest version of Reader)
•Download the Windows Installer Cleanup Utility from http://majorgeeks.com/Windows_Installer_CleanUp_Utility_d4459.html and run it;
•Run the tool from Start >Programs >Windows Install Clean Up;
•Select 'Adobe Reader' and click the "Remove' button; close the tool;
•Download the 9.3.3 installer http://ardownload.adobe.com/pub/adobe/reader/win/9.x/9.3.3/enu/AdbeRdr933_en_US.exe and run it;
•Download the 9.3.4 update http://ardownload.adobe.com/pub/adobe/reader/win/9.x/9.3.4/misc/AdbeRdrUpd934_all_incr.msp and run it.
Is there any error thrown when you try to update or uninstall Reader???
Peek at the AdobeARM.log file located in temp folder (%temp%), does it lists any error???
What is your operating system?