Computer won't start after bitdefender install

An earlier topic about the failing to restart after a bitdefender install the suggested fix was that he gave the SSD a knock and now it's running fine. That's plausible, HDD do sometime respond to that loosening method. Previous to installing bitdefender I had a kasperspy internet security which also caused a computer to jam up but release with F8. I uninstalled Kasperspy and the computer fired up from cold and would restart every time now I've installed Bitdefender have the same problem but computer won't boot at all, not even with using F8. It looks like there's something inheritance with some anti-virus causing computer to lock up? Any realistic suggestion would be helpful to fix the problem. Thank you

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