Duck is correct.
Check (with your finger) for any component that is getting hot to the touch.
If you can't find anything...assuming that the ICs are socketed, I would remove them and check voltage measurement again.
As Greg stated, check the orientation of the voltage regulator. Looking at the component side of the PCB...it should be the writing side of the regulator facing up.
You should take some pictures of both sides of the board and post them.
Many times a few more eyes over your shoulder can be helpful in spotting issues that you've overlooked.
Search the net for an image hosting service like dropbox, learn how to upload pictures to dropbox, right click on the Mona Lisa icon (Insert Image) above the first smiley on the left, something like this will appear on your post. [ img ] [ img] Go to the dropbox folder that contains the image you want to post, left click on the image, right click on "copy public link", center your curser between the two center brackets, [ img ] [ img] and right click. Left click "paste". The image will show up when you left click "post".