You can't just install Windows 98 over a Windows XP installation, for a start the file systems are likely to be different. If your hard disk is over 10gig Windows XP will most likely be using NTFS file system, and Windows 98 has to use the FAT, or FAT32 file system. Windows, of any kind, would never let you simply over-write an existing Windows installation anyway. You don't say if you want a dual boot system. Whatever you want, you will have to delete the existing active partition on your hard drive (losing all the data presently on it), reboot, create new partition(s) for whichever file system your operating system uses, reboot, then format the new partition(s). Then you can install operating system or systems into the relevant partitions. If not much of that makes sense, you'd better get in a professional.
I am running Windows XP Professional on a PC with a P4 2.0 Ghz processor and with 256 MB RAM. I wish to install Windows 98 on my PC but when I run the setup file I get the error
-"You cannot install Windows 98 while running this version of Windows.
Start your computer in MS-DOS mode and then install Windows 98. See the Windows 98 installation guide for further instructions."
What do I do as I require to install Windows 98?