I think vicroberts might be on to something, but more information is required for qurung to understand what to do. To get to safe mode, press F8 repeatedly after the BIOS splash screen. This should bring up a menu that is text only and responds to up and down arrow movement. Select "Safe mode" from the menu. This will show another screen of a similar color scheme of items being loaded by the computer. Do not worry about any of this: this screen is normal. A basic layout of your desktop will be loaded with no background and a typical 800x600 resolution.
Now, this is as far as I can take you. I do not know how to solve the problem any further. I hope my description helped in its own right. I just thought vicroberts left a vague description of getting to Safe Mode.