My windows will not work at all and the only way

Have you recently installed any new hardware or software before this happened,if so un-install it from the add and remove programs.Did you try the last configuration that worked .Try pressing f 8 key while booting and select this.Last try click on start then control panel go to system click on hardware,then device manager .Click on + display adapter's.Right click on video card and un-install .Reboot computer.It will reinstall video driver.If it still doesn't work, un-install video driver from add and remove programs and reinstall driver from cd or go web page for the newest driver.
Good Luck