If you are inexperianced...DON'T OVERCLOCK! Read up on it. There are tons of good OC'ing guides and walkthroughs out there, find them. In-fact, there's one in this topic, at the top of the page. Read it.
"There is no shortcut to a good OC." - Another T-F member.
You have to go slowly, patiently, and carefully.
Now - your problem is probally RAM. Your FSB is trying to run faster than your RAM is capable of running. Set up a memory divider when you OC manually.
Intel Q9400 | Gigabyte EP45-UD3P | G.Skill 2x2GB DDR2 1000 | XFX HD5870
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