Interestingly, I left it as it was all night and woke up to it telling me the install was complete, however, I'm assuming since I force quit, it did not install. Malwarebytes did not appear in the Applications folder or anywhere else on the drive after a thorough search. I installed it again and it finished in less than 5 minutes, launched it, scanned and it found nothing. So far the drive is still slow but not as bad as it was yesterday. I rarely use this tower as I am networked to it from my newer/faster laptop primarily. I have had several drives fail in the past, so I'm going to be cautious and watch it and hope that all stays well until I can afford to fix it. Thank you again for your assistance and advice, much appreciated.