There is an easy way to do that assmuning you already have a more powerful PC running Ubuntu.
- Download the latest copy of Ubuntu ISO image. As of today, the latest version of Ubuntu is 11.10.
- Run startup USB Creater.
- Put Ubuntu onto your USB flash drive. Please be sure you need to have a 1GB USB pen drive/CF/SD/MMC card. Make sure to backup the USB pen drive since Ubuntu is going to format it to load the OS.
- Configure your computer to boot from USB flash drive and boot from it
- Try Ubuntu or install to your hard drive.