It sounds like you have a fake malware version of Adobe on your computer. Download and run Malware Bytes and see if it finds anything and remove it. Also run a scan from your antivirus and see if it finds anything. If you check your installed programs you should still have your old version still there. To remove this old version you must download the uninstaller from the Adobe website and run it to remove it, make sure you restart your computer after you complete the uninstall. You then can go back to the Adobe site and download the correct version for your OS and the install it make sure you close your browser before you start the install. After the install restart your computer.