i dont know which thermal paste or grease i use but i think its a normal one and is pre-applied, my cpu is a bit old but i feel its ok, it is a intel pentium dual-core 2.80 ghz, and a asus P5QPL-AM motherboard and i use the same old windows xp, with about 2 gb ram(1918 mb usable). i want to know if 40-45C is good or bad temp for my pc, if yes what should i do. yes,my room temp is hot cause i live in india .