Vista is a bit different from earlier Windows, it has a different boot loader
As you are completely new to Linux I realise that you are scared, but I'll try to take it step by step
Open Computer (under Places in the menu or on the desktop)
> Filesystem > /boot > /grub
Look at the file menu.lst (double click like you are used to)
You should have some sections for Mint like this
and you should also have a section for Vista like thistitle Linux Mint 6, kernel 2.6.27-7-generic
root (hd0,8)
kernel /boot/vmlinuz-2.6.27-7-generic root=/dev/sda9 ro quiet splash
initrd /boot/initrd.img-2.6.27-7-generic
As Vista was there first you almost certainly have Vista on the first partition which is shown above# This entry automatically added by the Debian installer for a non-linux OS
# on /dev/sda1
title Windows Vista/Longhorn (loader)
root (hd0,0)
savedefault
makeactive
chainloader +1
There may be one more entry for Vista if you have some kind of recovery solution
If you find this entry take a look at the top of the file, you will find something like
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## timeout sec
# Set a timeout, in SEC seconds, before automatically booting the default entry
# (normally the first entry defined).
timeout 10
In either case you need to edit the file - add the Vista entry or change the timeout
Close the file
Copy this into a terminal (right click to paste in the terminal)
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gksu gedit /boot/grub/menu.lst
You now have menu.lst open for editing - make the changes, save and close the file
Hopefully you should now be able to boot Vista as well
I don't know what happened but I can assure you it is very unusual for something like this to happen and normally you don't have to edit important configuration files by hand