Do a search on "vshield" or the like and you should find an uninstaller. Google has a nice search engine, I hear🙄
Try a command-option-escape key stroke and then force quit that process; if that doesn't work, start Activity Monitor, find Vshield, and quit it.
Then contact Mcaffee and find out how to delete ALL the stuff that they installed on your computer. You do not need it, and it is obviously creating more problems than it solved (for you anyway; they got money).
Rob