This error is probably caused by another application or because the software wasn't installed correctly. My advice is to completely uninstall the application from your computer by using its own uninstaller. Then go to the installation folder
C:\Program Files\Software Informer and delete all the files. Access registry editor using Start > run > regedit and navigate to Local_Machine > Software and Current_User > Software. Locate Software Informer and delete all the keys.
After this process, reboot the computer and download the new version from the official page. Install it with Administrator access and everything should be fine.