How did you overclock it before? What are you doing different now? The best way for us to help you is to have you take digital camera pics of the relevant bios sections and attach them with you next post so we can see what you see in bios.
First crop and then save the pic to disc. Cropping is important if the image includes a lot of irrelevant surrounding desktop territory. In other words, we don’t want to see your whole desktop. That just shrinks down the important stuff we need to see so that it may not be legible. Snipping Tool in Windows Accessories is great for this if you have Vista or later. If not, you can use the built-in Windows keyboard stokes or download a freeware cropper/capture tool. Then click on Go Advanced at the bottom of any new post window. When the advanced post window appears, click on the little paperclip tool at the top. This will load the file browser/up-link tool and the rest will be obvious. You can attach up to three pics per post but you can go back later and add more if necessary.