identify this temp please... its running hot!

[littlekates]

this is on my father in-law computer. was wondering anyone can tell me if the temp shown "50c" is the cpu temp or the motherboard temp please. Spec is an Intel(R)celeron 2.8Ghz with 448MB RAM

 

[littlekates]

cheers. not sure what the max temp intel(R)Celeron D run @ but when i try to convert avi files to dvd formate it raise to 67c i guess this is abit hot. the pc itself was bought from PCWorld not custom made. should i clean the thermal paste and reaply with better one such as AS5?