Edubuntu Installation / Dual Boot Problem

[Theresa]

Hello all,

I've been lurking on this mailing list for quite a while. As you may, or may 
not, already know I've been doing this Edubuntu project for the past 4 months 
in my local highschool for my bachelor degree. So far so good, everything 
works like a treat with Edubuntu Edgy.
Now the school (the network admin) asked me to setup/install Edubuntu Feisty 
on a local machine. The only condition is that Windows XP will still be 
available, I've read lots of wikis and peoples reactions on dual boot, so I 
didn't consider it much of a problem.
I began installing Edubuntu Feisty from the Desktop CD, in the partition menu 
I chose

sda1 (being the windows xp parition) ..... I didn't touch this. it's NTFS 
format
sda2 (will be the linux partition) ......I think this was around 5gb as EXT3 
is my / partition
sda3 ...700mb as my SWAP partition
sda4 ..the rest of it probably around 15GB...EXT3 again as my /home partition

The installation aborted at 94% prompted by the following error message

"The execution of <<grub install (hd0) >> has failed. This is a serious 
problem" ... something along these lines.

At home I hooked up on IRC #edubuntu to get some answers to my problem.
So far I've tried

sudo grub
find /media/disk-1/boot/grub/stage1
---> this caused: Error15: File not found

I've also tried sudo grub-install /dev/sda2
prompted by "The file /boot/grub/stage1 not read correctly."

I really don't know what to do right now. Is it impossible to install Edubuntu 
Feisty on that machine? What caused these errors or why won't Grub install?!

I'll appreciate ANY advice.

Thank you in advance,

Theresa