If all you're worried about is the temperature, don't be. 80-85C is perfectly healthy. These chips will live happily in the 90+C range for many years without any ill effects.
That being said, crack the case and check the CPU fan, and check the PSU fan and the vents to atmosphere. likely as JaE has noted you have gathered up some dusty insulation...
Cleaning tip if that is the case ::
shutdown and unplug the tower
ground yourself to case (grab the case metal 1st)
hold and keep the fans from spinning you plan on cleaning, then liberally use air dusters rated for pc parts.
reboot and test.
failing that, do the fans spin at all or very slow (sub 1000rpm at al ltimes?) you may need a new fan
have you moved the tower recently ? in moving you may have gaped/separated the CPU and heatsink by thumping it around and the thermal paste is no good and or aerated.
and lastly .. is this a laptop? if so it may be 'normal' .. if ti is a laptop get some sort of standoff and make a 1/2 inch gap between the bottom of the laptop and the desk.
Cybert said: Capitlization and periods are hard for you, aren't they? I've given over $100 to techforums. I should have you banned for my money.