Only use the Intel Burn Test if you have at least 20C headroom over your load temp when running Prime95 or Orthos.
Intel® Core™2 Duo Desktop Processor E8400 - SLAPL
Intel says that for the E8400 the max safe temp is 72.4C. So in Prime95 or Orthos you only really want to be 50-55C. Anything over that and you may overheat your chip.
The Burn Test is very effective but uses the CPU so aggressively that once you start you can't stop it. Usually, everything freezes until the test is over. CoreTemp stops reporting temps after a second or two but my CPU is already 65+ by that time.
Have fun
Note: It may show up as a virus (on AVG it does) but this is a false alarm.