I have been using Total Security 08 on 3 computers (XP32) for a long time with a few issues here and there but overall very satisfied.
When I built my new Vista64 rig and installed the new Total Security 09 I quickly had issues with major BSOD and system hangs.
I have been trouble shooting every piece of hardware on my new rig, and speaking with tech support with Nvidia, XFX (MB and GPUs), Pioneer (my optical drive), OCZ (my old ram), Corsair and Bitdefender for 6 months.
I was asked to uninstall Bitdefender and see if my issues continue.
Issues gone completly!
Now I'm trying to decide what to replace BD with.
I really liked BD but the 09 just isn't worked out yet.