Have you checked the links below:
Although these articles are for various versions of Windows and Outlook Express, they may apply in your situation also:
OLEXP: Err Msg: "This Program Has Performed an Illegal Operation and Will Be Shut Down"
OLEXP: You Receive an Error Message or Are Unable to Start Outlook Express
If the above links don't help, have you tried uninstalling, then reinstalling Outlook Express?
Hope this helps.
Every time I attempt to open OE6, it says that my memory is full, followed by a message that MSOE.DLL could not be initialized, OE may not be installed correctly. I've tried downloading IE6 to reinstall, but the setup stops when it detects a newer version on my CPU. Please help, as I'm about to set myself on fire.