I decided to try one more thing. I had already done a system restore to a checkpoint a day before I thought these problems started. But tonight I did a restore to about 3 days before that. That fixed the Add/Remove problem and my Photoshop problem. They are fine now.
But I still can't install the newest version of Zonealarm and can't find any traces of it from the old version. I'll go back to the Zonealarm forum and seek help there since this (I hope) is no longer a Windows issue.
Thanks for your help.
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