installed Ubuntu gnome - think messed up the boot loader

[Hadi]

Hello!

I've installed Ubuntu gnome alongside of windows 7, though since i had 
two partitions, i  went through the manual installation.

before mentioning my problem, I'll say what i have done.
I had three partitions:
/dev/sda1: 100mb
/dev/sda2: 160gb  (my windows partition)
/dev/sda3:330gb  (for my ubuntu gnome)

I have selected /dev/sda3 for Linux installation and  set the formatting 
options.
Then, i accidentally chose the /dev/sda1 for putting the grub booter, do 
to the orca  (the screen reader) being  buggy in  the partitioning 
screen, it kept forcing me to fumble around with the keyboard.

What is happening now is that i can't load windows. I can't see the grub 
menu do to my visual impairment, but i suppose that the last item is 
always  windows 7. i  hold down  the down arrow key for 5 seconds then 
press enter, and nothing happens.
I believe i have messed up something by installing grub in /dev/sda1 
which was 100mb?

Thank you