Hi Louay,
Here are a couple of KB Articles that may help.
Troubleshooting MS-DOS Compatibility Mode on Hard Disks:
http://support.microsoft.com/default.aspx?scid=kb;en-us;130179&Product=w98
Large IDE Hard Disk May Run In Compatibility Mode:
http://support.microsoft.com/default.aspx?scid=kb;en-us;175629&Product=w98

Signature
Regards,
Bert Kinney [MS-MVP DTS]
http://dts-l.org/
How to Configure Outlook Express for Internet News:
http://support.microsoft.com/default.aspx?kbid=171164
> In my computer properties, the prefromance tab say's my
> system file is using Ms-Dos compatibilty mode not FAT32.
[quoted text clipped - 4 lines]
> problem appears again.
> My HHD. is Fujitsu 20GB (MPF3204AT)Ultra DMA support.