How do I uninstall Bitdefender Total Security 2010 from my computer completely?

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This program sucks and it gave me a virus in the process of downloading it. It didn’t find anything to begin with when I ran the scan. I uninstalled it from my computer last night, but it stopped in the middle and the program isn’t listed in the Control Panel Programs file. But it’s still on my Firefox dashboard and on it’s logo on the bottom right hand corner.

How can I delete it the registry file?

How can I get around my security settings on my computer if I cant remember my password?

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I set the privacy settings for my internet on my computer and I cannot remember my password to get in to change it.

Is this combination of security programs for my computer good?

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I have downloaded Norton Anti Virus 2003, Zonealarm and Ad-aware all onto my computer. Is this a good combination to have to keep my computer safe? Are there other programs that I should install as well? Have I installed too many programs? Answer would be appreciated!