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WARNING! There is ALWAYS some risk of losing data. Please ALWAYS make sure that you have a working backup of your important data prior to working with hard drive partitions. It does not matter if it is Windows, Linux or anything else. There is always a chance of data loss.
You will need to boot Knoppix with the cheatcode:
knoppix nofstab noswap

Then use fdisk or cfdisk to delete the Linux partition and any other swap partition if there is one. This will require a reboot. Then use qtparted to resize the NTFS partition.

Do you need to reload the Windows XP bootloader? Were you using a linux bootloader like lilo or grub? If so then you will need to view the docs at MS to reload the bootloader: http://search.microsoft.com/search/r...3&na=33&cm=512