You've got trouble. That message in itself is normal if you have not configured a security template for your machine. But unless you have access to NTFSDOS Pro or some other method of moving files to that NTFS partition, you are probably looking at a repair installation. After you get back to XP, you may want to make the policy changes that allow full access to the drive from the RC.
Here are directions for a repair:
http://www.michaelstevenstech.com/XPrepairinstall.htm
In a nutshell:
All you do is boot from the CD. When it asks if you want to repair and to press "R", don't. Continue with the installation just like you were installing for the first time.
You will then get a license agreement and it will ask you to press F8 to agree. Right after that screen, you will see a list of Windows installations that setup found. It will ask if you want to repair it. Read the directions on that page!!!
Then, you will actually press "R" this time and XP will re-install.
When done, you will be back to your familiar desktop with everything looking just like it did before. But all your Windows Updates are gone and you will need to get those again.
If you have any problems booting from CD, set the CD to boot earlier then the hard drive in BIOS setup, or come back for more help.
(Someone else will probably duplicate this post with a paste of a repeat of the directions and including steps to be sure you press "Next" when it appears, in case you would not have thought of that, but I'm sure you have enough information already

. Just follow the prompts.)