Follow-up on original post.
I originally said that the software would not reset my search engine. The developer contacted me immediately after my post and offered to enter my computer through changing your and resolve the problem. That was done today.
I now have Google back as my search engine. It is obvious that some type of malware made the initial change from my default of Google to Yahoo as my search engine. I ran full antivirus scans using both McAfee and Norton. The malware was not detected. I was not able to rectify the problem of having my default search engine changed through my normal procedures involving Internet settings.
I more than satisfied with this software. The developer stayed in contact with me on a daily basis until I was able to allow him to enter my machine and rectify the search engine issue.
02 December, 2016