Can't start new project....

[#1]

[#2]

You could try and reset the preferences.

But maybe you start with telling us something about your system. Did you install anything recently? Whichsystem is it? Windows 7? Are all the patches and whatnot installed? Is it updated (to the extent that is possible with Windows 7)?

[#3]

Fresh windows 7 install, then install Adobe photoshop, after effects, illustrator all running ok... except illustrator......