Since you did not provide enough information I will be extra helpful and aid you with getting answers from myself and others. Please answer the questions below.
Is 80 degrees in Celsius or Fahrenheit?
Did you build this yourself?
When did you build it?
Did it ever have a problem before?
Is the inside free of dust?
Is the heatsink on correctly?
Did you apply thermal paste?
Did you remove the pre-applied thermal paste?
Did you remove the plastic from the heatsink?
Is the CPU fan running?
What is your case?
How many fans does it have?
Are the fans running?
Is your graphics card blowing heat onto it?
What is the temperature of your room?
GIVE US ANY MORE INFORMATION! Next time follow this guide:
http://www.tomshardware.com/forum/264823-31-troubleshooting