Thank you Fumz for the Compliments.. Tried to give you some Rep, but says I must spread the LOVE first.. lol
OK. to start Bigman. you need to go to userCP at top left of screen. and enter all the info of your system under edit system Specs.
Also I don't know what GPU you have. so I don't know what type of overclock you can get. but I see it's running at 57c. thats not great. but not bad.. good enough to safely overclock.. depending on what model it is.
as for the CPU. your on the stock CPU Cooler I'm assuming. as those temps are to high. they should be around that temp at 100% Full load.
I'd invest in a decent Air cooler for the CPU, something like the Xigmatek 2-1283.. it's only 39.99 and it's rated in the top 5.. total! so it's one of the best price/performance coolers around. but make sure it will fit your case. that or the Tuniq Tower is a good one. I have that. the Thermalright Ultimate 120 "Extreme" is the BEST.. if your willing to sped $50 bucks.
Also almost all e6400's can hit 3.0 Ghz with half decent cooling. some higher. toping around 3.6 Ghz if your lucky on Air cooling. but thats pretty high. I'm thinkin something around 3.0 Ghz, maybe 3.2 Ghz for you. and that will show some good performance increases. plus depending on how good of a video card you have. the slow CPU could be holding it bakc. and 3.0 Ghz on CPU could unlease it's top performance. lol so fill out your system specs and look into better cooling, and you'll get to 3.0 Ghz stable... Mkay!