If your worried about Temperatures get one of these it will keep it cool.
http://www.newegg.com/Product/Product.aspx?Item=N82E16835186134
I using a P4 3.2 Prescott core and here are my temps.
First welcome to the forum! You know it might be something as simple as changing the Ethernet cable from the modem to the comp or a bad node your going through.
I swore on the bible when testifying for a friend in Court! I know I was not telling the truth! As far as I'm concerned the Bible is a guilt trip passed down through the ages. It was written by Man Century's after the fact, so how much truth or fact can be in it anyhow!