I am running XP with OA free and Avira AntiVir and I generally run Sandboxie. I am a security nut and love free software. I am considering adding Threatfire but not sure if it would be more trouble than its worth. Is the malicious behavior protection of Threatfire better than that of the HIPS in OA? If Threatfire is good or better, should I run it with OA Program Guard turned off? Would Threatfire cause problems with my setup? Any recommendations would be appreciated!