There is the potential that something *could* happen when mixing NTFS and FAT32 on the same drive. That is not to say it will.

If you are worried, I'd consider backing up any essential data to physical media (CDR, CDRW, external HDD, DVDR, DVDRW etc..)

Then try it. If you want the windows 98 OS to have NTFS read-only support, then try this page out:

http://www.purenetworking.net/Produc.../NTFSfor98.htm

Here's what MS says about Multi-OS environments:

One OS Per Partition

Before installing Windows XP and an earlier version on the same machine, you must prepare your hard disk with different partitions.

When you install Windows on a new or reformatted hard disk, the Setup program typically does not partition your hard disk automatically. To create multiple partitions, choose Advanced Options during Setup and follow the instructions to create and name multiple partitions. You can also create partitions using Fdisk.

If you have already installed Windows, and you have only one partition, you must reformat and partition your hard drive before you can multiboot.

You can divide your hard disk into multiple partitions, and each partition can function as a separate logical drive. For example, logical drives C: and D: can both exist on the same hard disk, but function as separate disks. You should install each operating system on a different partition. Then install applications on the same partition as the operating system with which you run them. If an application is used with two different operating systems, install copies on both partitions. Placing each operating system in a separate partition ensures that it will not overwrite crucial files used by the other OS.

A basic disk can contain up to four partitions. Each partition can be formatted for use by a file system, such as FAT32 or NTFS.
http://www.microsoft.com/windowsxp/u...multiboot.mspx

Several guides/Info below on Windows 98 and windows XP dual booting:

http://www.vlaurie.com/computers2/Articles/dualboot.htm

http://www.dougknox.com/xp/tips/xp_repair_9x.htm

http://www.petri.co.il/install_windo...windows_xp.htm

And below is an article describing how to remove 98 after you've done the dual boot if you are not satisfied with the results.

I believe the important steps if you try this is to back up your data first.

Prepare the partitions, 2 logical partitions on the same drive *should* work. And then follow the guide that you posted in your first post.