I currently have XP Home installed and running on my notebook ACER. The Home Edition came with many additional programs I do not want to use and I have not CD with the XP Home Edition.
I have XP Pro Corporate and would like to replace the existing Home edition with XP Pro Corporate. How to do this? I am not beginner but I am not experienced enough.
Thank you in advance

Put the new OS disk into the CD drive, power off the computer, power on and it should start to boot from the install CD. Follow the instructions from there.

If it does not boot to the CD. Check the BIOS settings and change the boot order to the CD being the first boot device.