You will need to go a computer running a 32 bit version of Windows 7 or Vista and create a bootable copy then do a custom install over your Windows 8 64 bit installation;
Boot from the Windows 8 DVD or USB thumb drive you create
Click Install Now
Accept License Agreement
When the option is displayed to select an installation type, click (Custom Advanced)select the disk partition where you would like to install Windows 8 Click Next.You will receive the following warning:The partition you selected might contain files from a previous Windows Installation. If it does, these files and folders will be moved to a folder named Windows.old. You will be able to access the information in Windows.old, but you will be able to use your previous version of Windows.(At all cost, do NOT click anything named Format or Delete or Partition. So even doing a custom install, your personal files are still preserved. Click OK Setup will now start the installation. During the installation, your machine will be restarted several times.When the installation is complete, you can complete the Out of Box experience such as selecting your laptop, create a username, password, your time zone. You can then proceed to download the latest updates for Windows and reinstall your applications and drivers.You can then recover your personal files from the Windows.old folder and reinstall all your applications and drivers.