Did you run McAfee Consumer Product Removal tool (MCPR) before installing Norton?
https://service.mcafee.com/?articleId=TS101331&page=shell&shell=article-view
Your browser displays fake McAfee notifications
https://service.mcafee.com/?locale=en-US&articleId=TS102999
McAfee is tracking an increase in the use of deceptive popups that mislead some users into taking action, while annoying many others. A significant portion is attributed to browser-based push notifications, and while there are a couple of simple steps users can take to prevent and remediate the situation, there is also some confusion about how these should be handled.
https://www.mcafee.com/blogs/other-blogs/mcafee-labs/how-to-stop-the-popups/
The “Your McAfee subscription has expired” pop-up is a browser-based scam that displays fake error messages to trick you into subscribing to a service that you don’t need.
This guide teaches you how to remove “Your McAfee subscription has expired” scam for free by following easy step-by-step instructions.
https://malwaretips.com/blogs/remove-your-mcafee-subscription-has-expired-today-popup/
How to install and run a scan with Malwarebytes (Guide)
https://malwaretips.com/blogs/scan-malwarebytes-anti-malware-2-0/
The McAfee Consumer Product Removal (MCPR) tool described in the McAfee support article TS101331 is only designed to remove the last traces of full McAfee antivirus products like McAfee LiveSafe and McAfee Total Protection. This tool will not remove utilities or browser extensions like McAfee Safe Connect, McAfee WebAdvisor, etc.
Did you download your Adobe Reader from the official Adobe download page at https://get.adobe.com/reader/, and if so do you remember enabling the option to install the free McAfee Security Scan Plus at the same time? By default, McAfee utilities should not be bundled with Adobe installers downloaded from the official Adobe site unless you choose to do so.
If you downloaded an Adobe Reader installer that was bundled with a "legitimate" version of McAfee Safe Connect then according to McAfee you should be able to uninstall McAfee Safe Connect from Control Panel | Programs | Programs and Features. See the following McAfee support articles:
TS102812 - How to Uninstall Safe Connect
TS102654 - What is McAfee Safe ConnectIf you can't uninstall McAfee Safe Connect from Control Panel | Programs | Programs and Features and/or Settings | Apps | Apps & Features then I would agree with peterweb and bjm_'s suggestion to see if a scan with Malwarebytes Free (available at https://www.malwarebytes.com/mwb-download) is able to find and remove the last traces - assuming it classifies the program you installed as malware or a PUP (i.e., a potentially unwanted program like a browser toolbar, adware, etc.). I usually recommend that Malwarebytes Free users deactivate the 14-trial trial of the Premium (real-time protection) features after installation at Settings (gear icon) | Account | Deactivate (see Deactivate Premium Trial in Malwarebytes for Windows) and just use Malwarebytes Free as a second-opinion on-demand scanner. I also have Malwarebytes configured to warn me before it removes any PUPs or PUMs at Settings (gear icon) | Security | Potentially Unwanted Items so I have a chance to review any lower-risk threats like browser toolbars, etc. detected by Malwarebytes that I might actually want to keep.
https://community.norton.com/en/comment/8526578#comment-8526578