just download ubuntu and wrote it to a disc. And before i make the partition, What filing system should i use? FAT32 or Linux Ext2.

Isn't ext3 an option?

ext3 is ext2 with journalling added in.

ok....ext3 i made it, now when i install linux will it auto use the ext3 partition?? And ignor not bother the NTFS one?
Also will it update the Boot.ini by its self?

Hmmm...

Have you read the install procedures? (I am guessing "no" by your questions)

Summarized and simplified, Linux will ask for permission to install GRUB or LILO into your Master Boot Record (MBR) on your first (boot) drive. Let it. It will not (and really, it can not) modify anything on your Windows NTFS drive. boot.ini is NTLDR's config file, and it will not be used by Linux (unless you go through some manual steps to do it yourself).

Also, you don't need (or want, really) to create filesystems for your Linux install, unless you know what you are doing. Just leave some blank unpartitioned space, and tell it to install in unused space, and it will set up 2 or 3 partitions for you. Minimal effort on your part.

no complaints with ext3 and grub in the mbr here.

ext3 is the default filesystem for Ubuntu.

ok thanks alot.How to edit the grub file?
to make windows xp boots as default? Also delete the recovery line and the memtest line

So that there is only
Windows xp
Ubuntu

There may be a GUI utility that Ubuntu has to alter your boot options.

The way that works on all Linux installs is to just edit yoru grub.conf text file. It is well-commented (if I recall correctly) and simple to edit which is your default and remove boot options. Why would you want to remove the memtest and recovery modes, anyhow?

You need to be root (or properly sudoed to your text editor) to modify that file. You might be able to find it (or a symbolic link, which is the same for practical purposes) in your /etc/ directory. If not do a locate grub.conf and let Linux tell you where it is.

BACK UP IMPORTANT FILES!!!
Seems like you have no clue what you doing with a backup you can **** up and you importnatn files will be safe

if ubuntu supports them, then i'd use XFS or ReiserFS, there by far the quickest and most space efficient.