You must address file system compatibility to ensure a multi-booting configuration with these earlier operating systems and Windows XP. Remember to install the latest operating system last, otherwise important files may be overwritten.

Checklist Summary

To configure a computer containing Windows XP and Windows 9x or MS-DOS, review the following guidelines:

On computers that contain MS-DOS and Windows XP:

• MS-DOS must be installed on a basic disk on a partition formatted with FAT. If MS-DOS is not installed on the system partition, which is almost always the first partition on the disk, the system partition must also be formatted with FAT.
• Windows XP must be installed last. Otherwise important files needed for starting Windows XP could be overwritten.

On computers that contain Windows 95 and Windows XP:

• As in the case above, Windows 95 must be installed on a basic disk on a partition formatted with FAT. (For Windows 95 OSR2, FAT32 may be used.) If Windows 95 is not installed on the system partition, which is almost always the first partition on the disk, the system partition must also be formatted with FAT (or FAT32 for Windows 95 OSR2).
• Compressed DriveSpace or DoubleSpace volumes won’t be available while you are running Windows XP. It is not necessary to uncompress DriveSpace or DoubleSpace volumes that you will access only with Windows 95.
• Windows XP must be installed last. Otherwise important files needed for starting Windows XP could be overwritten.

On computers that contain Windows 98 (or Windows Me) and Windows XP:

• As in the cases above, Windows 98 or Windows Me must be installed on a basic disk on a partition formatted with FAT or FAT32. If Windows 98 or Windows Me is not installed on the system partition, which is almost always the first partition on the disk, the system partition must also be formatted with FAT or FAT32.
• Compressed DriveSpace or DoubleSpace volumes won’t be available while you are running Windows XP. It is not necessary to uncompress DriveSpace or DoubleSpace volumes that you will access only with Windows 98.
• Windows XP must be installed last. Otherwise important files needed for starting Windows XP could be overwritten.