If you are using Windows 7 you would want to go to Programs & Features. Is this where you are do not see them listed? Did you run a registry cleaner recently?
I did go to programs and features, it is not appearing in add/remove
programs. I do have registry booster and it runs about once a month.
Jeff A Wright http://forums.adobe.com/people/Jeff+A+Wright created the
"Re: Can't unistall trial version of Photoshop CS5 extended in Windows 7"
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Ok it is likely Registry Booster has removed the associated entries from your registry which is why it is not appearing. I would recommend creating a back up of your registry in the future prior to utilizing any type of registry cleaning/optimization product.
You can try utilizing the Adobe Creative Suite Cleaner Tool - http://www.adobe.com/support/contact/cscleanertool.html to remove the software.