It appears that the software that shipped with my Dell Inspiron included a Sonic module: DLA. When I try to start the software, I get an error message that Audio.msi is missing. I have done a search on my C drive and cannot find it. Any ideas on how I should proceed?

Sounds like Dell didn't make sure everything was configured and the program is trying to finish the installation. If they sent you install cd's you should have one for the Sonic software that you can put in and point the installer to it. If not, have you tried contacting Dell yet? They should be able to help you with this.