Strange Outlook Express errors (identity login could not be started)

I’ve been helping a neighbour with his computer, and it seems like every time I fix something, something else goes wrong. On Saturday night was was doing some updates and everything seemed to be running better, then he tried to install some software, and now Outlook Express is giving all sorts of errors. I’m hoping the following articles will help:

The identity login could not be started. Some components are either missing or incorrectly configured.

Outlook Express could not be started. It may not be installed correctly. Make sure that your disk is not full or that you are not out of memory. Contact Microsoft support for further assistance (0x80040154)

Error starting program. The COMCTL32.DLL file cannot start. Check the file to determine the problem