Is the CPU too hot?

Hi,

My computer specs are as follows:

OSes: Windows XP Pro
Motherboard: ASUS P5ND2-SLI
Processor: Intel Pentium D 830 3.0GHz (not overclocked)
Hard Drive: 250GB SATA
RAM: 2x 512MB DDR 667MHz
Video Card: ATI Radeon X1300 PRO
Optical Drive: Pioneer DVR-110D DVD-RW
USB: 4x USB 2.0
Sound Card: 7.1 Channel
Ethernet Adapter: Intel 10/100/1000 Gigabit

I dont know but I think my Pentium D 830 is too hot. Upon startup
(after being left off for about 10 hours), the CPU temperature is
around 45C (celsius) and steadily rises to about 70C. Even when I'm
not doing anything on the computer the temperature varies from 70C -
75C. When I am doing stuff, playing games, browsing the net, etc. the
temperature is around 75C - 81C. When I am doing big multitasking, the
temperature varies from 81C -86C. Is this normal? I know Pentium D
chips are hot but are they supposed to be this hot?

Thanks