In the link below are instructions for installing Ubuntu.
Installing a Dual-Boot with Windows and Ubuntuhttp://www.psychocats.net/ubuntu/installing
Recommended minimum requirements
Ubuntu should run reasonably well on a computer with the following minimum hardware specification. However, features such as visual effects may not run smoothly.
* 700 MHz x86 processor
* 384 MB of system memory (RAM)
* 8 GB of disk space
* Graphics card capable of 1024x768 resolution
A network or Internet connection
Note: All 64-bit (x86-64) PCs should be able to run Ubuntu. Use the 64-bit installation CD for a 64-bit-optimised installation.