How to correct a chmod +x * -R command

Hello all and Merry Christmas, I have done a stupid thing and issued a chmod +x * -R command while in the / directory. This is on an internal server, not connected to the 'net. I had thought I was in my /public directory but wasn't. The command stopped with an error when it got to the /proc directory but by then it was too late. What are the consequences here and what can I do to rectify them? All help appreciated Keith Gibbons