Installer Update Failure


I tried to install this update, but in the middle of the optimizing part of it, I got a kernel panic while ejecting a cd. Now I can't use, and Software Update tells me there is an error while checking for updates. logs these messages when I try to start it:
Launch failed with error code -2857
2001-11-09 12:39:29.966 SystemUIServer[322] Got nil as the string argument in NSMutableString. Pass empty string instead. Will probably crash.
2001-11-09 12:39:30.822 SystemUIServer[960] *** Assertion failure in -[NSMenuItem initWithTitle:action:keyEquivalent:], NSMenuItem.m:83
2001-11-09 12:39:30.823 SystemUIServer[960] Exception raised during posting of notification. Ignored. exception: Invalid parameter not satisfying: aString != nil