If your problem persist and you are not able to remove file that way, go to the search results (step 2) and try to manually delete all the occurrences of foxit reader : If the process is running, you will not be able to delete the file.
Than try to uninstall that program in a standard way.For example, if foxit reader updater.exe is found in folder C:\Program Files\Dummy game\**some subfolder**, it most probably belongs to "Dummy game" software package.
Try to locate program, to which the process foxit reader updater.exe belongs.
In couple of minutes, seconds if you're lucky, Windows will find all the copies. Than type 'foxit reader updater.exe' into search box.
Press F3 key to open standard search window.Restore point will help you to revert changes, if something'll go wrong.
Create Restore point for Windows (not available in Windows XP).