Upgraded Safari when prompted. Safari7.1 uploaded, then woudn't open, says it requires OS 10.9.1 to work and wants me to upgrade to Yosemite from Lion. I want to delete the new upgraded Safari because it doesnt work with my older OS, and reload the older version of Safari (6.5.1). but i get message saying "can't delete the application because the OS needs it to function." So what do I do next? Does this mean there is a malware that was downloaded in the upgraded version of Safari? When I click on the Safari version Get info, says it is 7.0.4, installed in 2011. Icon has a line bar through it and is faded, in menu bar and on logo version in Apps folder.
I am running MacBook Pro 2011, OS 10.7.5 Lion; 2.4 GHx Itel Core i5, 4GB 1333MHz DDR3.