Bsod Acv3.sys After Turning Off Pc

Hi,

today i turned on my PC and could not get in my Windows account. Every time i started logging in i get a Blue Screen of Death with the information in this same topic:

http://forum.bitdefender.com/index.php?showtopic=38093

Is there anything i can do? I have now de-installed Bitdefender and can use my PC. Once i install Bitdefender i get BSOD.

Thanks,

Joao

Using Windows 8.1 x64