Black Screen From Boot Up

I've installed Bitdefender Total Security 2012 (evaluation licence) on my dad's laptop, Vista operating system. At first it seemed to work ok, but then he would receive a black screen on booting up and it wouldn't enter windows. I got him to boot up in safe mode and uninstall Bitdefender and now the laptop boot_s up and enters windows without problems.


I searched for similar issues on this forum and noticed that there is a conflict between Comodo firewall and Bitdefender. The laptop did have Comodo firewall installed on it a couple of years ago, but it was uninstalled a long time before I installed Bitdefender.


I'd like to continue the trial of Bitdefender on his laptop. Can you please advise what is causing the conflict?


Thanks.

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