I just bought a powerbook - week ago - acting totally buggy-have i been hacked due to poor security of lion?

i was hacked with my old mac book i just bought a macbook pro - week ago it is acting totally buggy - tried 3 browsers safari opera and now firefox - won't download embeded video - just stops etc - what security 'fixes' are available for lion to prevent hacking battery component and malware installed

You have not been hacked.  It's impossible to speculate about what exactly the problem is, since all you've said is that it won't download embedded video.  You may just need to update Flash, or you may be using a bad site, or you may have a bad internet connection...  impossible to say with such sparse data.  But it's not hacking and it's unlikely to be malware.  Regarding the malware issue, see my Mac Malware Guide.
(Note that my pages contain links to other pages that promote my services, and this should not be taken as an endorsement of my services by Apple.)

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