Turn off OpenGL in teh prefs, check your system graphics settings and CoDecs.
We need to know a lot more if we're going to help you.
What version of After Effects? Have you installed the recent updates? What operating system? What kind(s) of source footage? What were you doing when the problem occurred? Has this ever worked before? What other software are you running? Do you have any third-party effects or codecs installed?
ill let ya know anything you need to know.
im using cs4 9.0.3 which last time i checked was the latest version for cs4
checking for recent updates was the first thing i did and just did again right now to make sure. it says there are no updates for me
im using windows vista
im using footage from a canon dslr and using encoder to convert them to AVI
it didnt crash when i was using it i just went to use it and it crashed at start up
yes it worked before i used to use it very often
im usually running premiere pro with it
and yes i have plugins purchased for after effects