Insecure Startup Item disabled

Hi, i've got a problem with my mac - version 10.6.6.
Everytime i log on i get the message:
"Insecure Startup Item disabled"
"/Library/StartupItems/LexSleeperX" has not been started because it does not have the proper security settings.

I know this is due to my lexmark printer, which i've now uninstalled. I don't understand how to remove LexSleeperX - i've searched on spotlight and its not there. Also, when I access the Library folder, there is no Startup Items folder at all.

Anyone got any ideas? Thanks

Type this in Terminal

ls -la /Library

Do you see StartupItems now?

Is LexSleeperX in /System/Library/StartupItems ?