My photoshop cs5 extended locked up. When I restarted my notebook, I received a message: your computer config changed. When I tried to re-activate, I received a message: activation system is not available at this time. I have my serial number but I do not have my activation code. What is my next step. I did register my photoshop with adobe when I purchased it
Reset the preferences. Start PS and immediately hold down ctrl alt shift (option cmd shift on mac). If fast enough you will get a reset window.