I haven't yet tried any of the following combinations. OS: Windows XP Pro SP3. I already have NOD32 and Sandboxie (Paid). I am primarily concerned about selecting a good HIPS with minimal/no conflicts. Windows XP Pro Firewall. 1. Online Armor (Paid) 2. Threatfire (Free) + Comodo (Firewall Only) 3. Mamutu + Comodo (Firewall Only) What feedback/comments/suggestions do you have on these choices? Would you recommend any other combinations? Thank You in Advance.