Upgrading to WinXP SP2

[Guest]

I had a problem with my C: drive a while back so I installed WINXP Pro SP1 on
my second hard drive D:. Now I want to format my C: drive and do a clean
install of WinXP Pro SP2. If I do this:
1) How can I be sure I will boot to the C: drive and not the D: drive after
I install the new OS?
2) Will I still be able to access the D drive to copy files (I will, of
course backup the D: drive before before I do anything drastic)?
3) If I run into a problem, will I be able to go back to my previous
configuration (i.e. boot to D: and access my applications as before)?

Thanks for any information you can give me.

 

[Guest]

1st physically disconnect D: drive when you install xp to C:.Youre pc will
boot
to the drive as set up in the BIOS,1st boot device or similiar,once youve
set the
right drive the other will not boot up to xp.