Hello,
Thank you for quickly replying and helping me find a working solution. Before using the ESET Uninstall Tool, I rebooted into safe mode and disabled "Self-Defense", located in HIPS tab in the Advanced Settings options. It took me a little while to find it but I did find it. I also disabled a few other boot-up settings but after doing this and rebooting into safe mode, I was finally able to remove ESET Smart Security V9 without using Uninstall Tool.
Thank you for your help and product