52c

In Idle state Processor temp is 52C but when on load like I convet movie to dvd it Goes to 68C. At 52c temp my fan run at 1150-1200 Rpm and at 68C it run at 3000 Rpm. IS this all correct or not and motherboard temp for both Zone 1 & 2 fluctuate between 45-50. 2 is allways 2-3 degree Higher.

I hav intel p4 3.0 ghz processor with HT. i hav 2 Hard disks, 1 SATA of 160 GB and 1 PATA of 80 GB. ram is 512 MB my comp starts wid a temp of 40C but in about 40 mins it goes upto 52C. it becomes stable after reaching 56C. Is my cpu overheating N how can i Prevent it....wat's da ideal temp...