I don't think that the temperatures are related to the motherboard or the turbo boost settings. It sounds like you installed the heat-sync or thermal paste incorrectly. I would advice reading this article and verify that everything is seated and installed properly.
What are the idle temps? They should hover around 30C - 35C. If not, double check the cooler installation, as jkhoward suggested.
It could be also the board itself by putting too much voltage into that CPU, as the H61's were the low-ends for Sandy Bridge.
Idle temps are 43c to 47c, so not good at all. Would you say it's a good idea to lowe the voltages? Even if that's possible on an H61. Stock cooler was installed properly, and since thermal paste comes pre-applied, I doubt there was any problem with that either
Alright then, tomorrow I'll order a new thermal paste and re apply it. 70% rubbing alcohol would be ok to remove it? And one very last question, what should I do to keep my cpu temps cooler these days? I won't play any games, but anything that gets me below 50c by simple web browsing or skype would work.