Question : interactive services detection stopped working

Vista Business on HP Compaq 8510p.
My Canon lbp3200 printer stopped working. While trying to re-install (latest canon driver) the error message "Interactive Services detection stopped working and was closed".
While updating Windows, the error message "Windows installer stopped working and was closed". appeared.

Why?

Answer : interactive services detection stopped working

Won2Ok--Perhaps of help
http://www.eggheadcafe.com/software/aspnet/35099697/vista-errors-what-should.aspx
http://social.technet.microsoft.com/Forums/en/winserverprint/thread/02c3b05d-25ca-4f65-8cc9-0c166eeee111