How to transfer all programs from old Hard drive to New one

I want to transfer all my existings files and programs in my current hard drive of 20GB to a new hard drive of 80GB. I need to do this urgently because my system keep on warning me that i am running low on hard drive. Infact i have about 2GB space left on my hard drive. Please can someone kindly tell me how to transfer all my existing programs to a new hard drive.

Files and settings transfer: http://www.microsoft.com/windowsxp/using/setup/expert/crawford_november12.mspx