Unable to connect to internet or load cd's with ubnuntu up and running

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http://askubuntu.com – I upgraded from ubuntu 9 to ubuntu 11.04. Everything went fine until the program was about finsished and then couldn't connect to the interenet. I now get the following message when I try to run a cd or load any software. An error occurred while loading the archive Command line Output Archive: /media/cdrom0/INSTALL.EXE [/mediacdrom0/INSTALL.EXE End-of-central-directory signature not found. Either this file is not A zipfile, or it constitutes on disk of a multi-part archive. In the Latter case the central directory and zipfile comment will be found on The last disk (s) of this archive. (HowTos)