I have been trying to download Adobe Reader and keep getting a ‘UI_Installer’ dialogue saying ‘Only a single instance of this application can run’. I have tried different download sites and different browsers but just get the same. Can anyone shed any light on this for me? I have had previous versions installed on my computer but have uninstalled and can't find any trace of them now
You may want to try the following.
Remove all traces of Reader (not only the program) from your system using the Windows Installer Cleanup Utility. This is no longer supported by Microsoft because it can produce problems with Win 7, but you can still download it from from places like
Then, download the Reader installer from
and perform a clean install.