Are you using stock intel cooler? Those things are absolute garbage. Get this
Arctic Cooling Freezer 13 Pro CPU Heatsink Cooler for Intel and AMD 1156/1366 AM2/AM3 W/ 120MM Fan - Arctic Cooling - Freezer13Pro from your most convenient website or local store. They are very cheap and do very well with Cooling. I have two of these in both my bot computers. my cpu's never go above 70 while botting 7-10 accounts with cpu's under very heavy load. You don't need anything fancy or expensive. This should do the trick for you and it's amazingly easy to install. The Evo 212's are also good for the same price range but you will have a better experience with the Freezer 13 when it comes to ease of installation and removal. I have two EVO 212's sitting in my shelves and I refuse to ever work with those again.
Don't forget to remove the thermal paste from the processor. Use an appropriate liquid to remove it. I usually use a flintless Q tip to soften the thermal paste and then use a piece of tissue to wipe most of it off and clean then finish cleaning it with the same liquid. Let it try for about 15 minutes and then install the heat sink. The freezer 13 and many other heatsinks come with thermal paste pre installed so keep an eye out for that. If you decide to add thermal paste yourself just put a grain of rice worth of thermal paste in the dead center of the processor and then install heat sink, Easy stuff, just be very careful not to bend pins or apply too much liquid when cleaning.