Sting,
I wonder if you over-reacted by reformating and reinstalling.
I have had terrible problems that sound eerily like yours, where suddenly I am unable to boot. First impulse was to do what you did, but instead I rebooted in safe mode, and removed every trace of ZA. And Voila, everything worked.
My ISP told me they have many support calls that are caused by ZA, and sent me detailed instructions how to remove it. They went on to say the ZA uninstaller does not remove many of the references in the registry, and leaves a bunch of files that mess thing up too. I found this to be true.
The uninstall instructions can be found in my post here: http://discussions.virtualdr.com/For...ML/049423.html
I have become suspicious that ZA is a worse virus than the viruses it purports to protect us from, as it has caused both instability and unrecoverable crashes for me.
Will
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It doesn't take much talent to be a critic.
It doesn't take much talent to be a critic.