installed windows on partition lost Mint grub

[Kinetic1001101]

I have a singe 500 GB HDD in my tower. I have Windows XP on first partition, Win7 on second partition, Unallocated third partition and Mint on fourth partition. I am wondering when I enter the code:

sudo grub
> root (hd?,?)
> setup (hd?)

what do I put in place of the ? marks if I want to fix Grub loader?

I was thinking:
> root (hd0,4)
> setup (hd0)

I am probably totally wrong. Any help soon would be great. Am I even doing the write approach?

More details: I had four partitions before I installed Windows 7 (Part1.. XP , Part2 empy NTFS , Part3 unallocated and Part4 Linux Mint) Before the Win7 install the computer would go into linux mint "grub" boot loader and I would choose either Linux mint or XP. Worked fine. Then I lost that after installing Win7... No I have different boot screen allowing only older version of windows(XP) or Win7. What to do?

Thanks in advance!

JC

[andrewthomas]

https://help.ubuntu.com/community/Grub2#Reinstalling%20from%20LiveCD

[oldfred]

Does Mint use grub or grub2. The way to reinstall is different.

How to restore the Ubuntu/XP/Vista/7 bootloader (Updated for Ubuntu 9.10)
http://ubuntuforums.org/showthread.php?t=1014708

Windows moves all the boot files from a second install to the first install. Windows only boots from the primary partition with the boot flag. So if XP was your first install & had boot flag, then win7's boot files are in the XP partition. Grub will not then find the win7 install to boot as the boot files are only in the XP partition. Since 7 is newer than XP, it may have converted the boot in the XP install to a win7 boot and added the XP boot to a win7 menu.

To get each MS to have its own boot loader make a second primary partition and set its boot flag on, then install the 2nd product in it. Multibooters, Pictures here worth 1000+ words
http://www.multibooters.co.uk/multiboot.html
A user who installed two windows & it worked to boot from grub directly
http://ubuntuforums.org/showthread.php?t=1271600

[Hippytaff]

https://help.ubuntu.com/community/Grub2#Reinstalling%20from%20LiveCD

Are you^ a link bot - keep seeing your link posts dotted around :-D