intall windows without Ubuntu uninstall

I don't know if it helps,but try to resize your partition, and format into ntfs , if you only have 1 partition , and install windows in there and after that you have update grub.if you have more than 1 partition or hard disk it works the same thing.

Thanks Duncan but that sounds a bit too challenging for a techno dummy like myself! Does anyone know of a computer professional (Brighton & Hove area) who might be able to help me out on this?

You will need to boot to the liveCD and resize the Ext4 partition. Make sure your backups are sufficiently recent in case of catastrophe. You can then boot to the Windows install CD and install to the free space. Windows is primitive and cannot resize the partitions like Ubuntu can. You will then need to boot to the Ubuntu CD and reinstate Grub2 as the Windows installer will blindly overwrite Grub with it's own bootloader.

Thanks, but I am a bit of a techno dummy!
Could you explain in very simple non-jargon speak what "boot to the
live CD and resize the Ext4 partition" and "reinstate Grub2 as the
Windows installer" means and how I do those two things?
Sorry to be so thick
Regards,
Tony Laycock
On 13 Jul 2011, at 15:31, actionparsnip wrote:

Your question #164642 on linux-source-2.6.20 in Ubuntu changed:
https://answers.launchpad.net/ubuntu/+source/linux-source-2.6.20/+question/164642

actionparsnip proposed the following answer:
You will need to boot to the liveCD and resize the Ext4 partition. Make
sure your backups are sufficiently recent in case of catastrophe. You
can then boot to the Windows install CD and install to the free space.
Windows is primitive and cannot resize the partitions like Ubuntu can.
You will then need to boot to the Ubuntu CD and reinstate Grub2 as the
Windows installer will blindly overwrite Grub with it's own bootloader.

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The live CD is the CD you installed with. It gave a desktop OS without changing your system as it runs in RAM. There are guides all over the internet on how to resize partitions, you will find one extremely easily.

This guide shows how you can reinstate Grub2 after Windows kills it off:
http://ubuntuguide.net/how-to-restore-grub-2-after-reinstalling-windows-xpvistawin7