While in your BIOS press F5, accept it, the F10, to exit and save changes.
Oh, this too.
To better help us to help you would you please add your systems specs? Here's the correct way to do it. :SystemInfo See Your System Specs Under System Manufacturer/Model Number add whether it is a desktop or laptop and whether self built. Very important Log in to Seven Forums and you will be able to transfer the info directly to the specs page in your profile from within the System Info app.
After doing this your specs will be available in each of your posts
Click on My system Specs
in the lower left of this post to see how it should look.
Full instructions are in the tutorial.
Testing your RAM may be useful. RAM (memory):