Can't boot back to Windows XP :S

I installed 7 on the same partition as XP, thing is I cannot boot to my XP desktop, the boot.ini before Win7 install looked something like this:
---
;
;Warning: Boot.ini is used on Windows XP and earlier operating systems.
;Warning: Use BCDEDIT.exe to modify Windows Vista boot options.
;
[boot loader]
timeout=3
default=default=multi(0)disk(0)rdisk(0)partition(1)\WINDOWS
[operating systems]
multi(0)disk(0)rdisk(0)partition(1)\WINDOWS.OLD="Microsoft Windows XP Professional" /fastdetect
c:\CMDCONS\BOOTSECT.DAT="Consola de recuperación de Microsoft Windows XP" /CMDCONS

--

now it is:
--
;
;Warning: Boot.ini is used on Windows XP and earlier operating systems.
;Warning: Use BCDEDIT.exe to modify Windows Vista boot options.
;
[boot loader]
timeout=3
default=c:\CMDCONS\BOOTSECT.DAT
[operating systems]
c:\CMDCONS\BOOTSECT.DAT="Consola de recuperación de Microsoft Windows XP" /CMDCONS
--

I tried copy-pasting the line to boot the OS:
multi(0)disk(0)rdisk(0)partition(1)\WINDOWS.OLD="Microsoft Windows XP Professional" /fastdetect
but a black screen with this came up:
corrupted file from
<windows root>\system32\hall.dll

What can be done here.

I find responsive Windows 7 but all my old programs are on XP and I'd like to dual boot fine.

 

You installed Windows 7 on the same partition? That means you installed Windows 7 over the top of XP. You can't go back to XP - it's gone.

If you installed Windows 7 on a different partition, you would see a boot loader where you could select Windows 7 or other operating systems on the drive.

 

Your Windows.Old folder says it all. You overwrote XP by installing W7 on the same partition. You lost XP.

 

Quite incorrect.
At the boot up there's a boot loader, one option says 'Windows 7' , another one it says 'Earlier versions or Windows', the latter invoques the old boot.ini file which is exactly what was presented to me before installing 7.
Thing is I'm having an issue with a corrupted file, I will use the XP recovery console and see if that file can be repaired.

I've dual-booted in the past, so I'm pretty sure I can still access Windows, there's the Windows.OLD directory with all files intact but with corruption on the hall.dll file.

 

Since you've dual booted before, you know combining two operating systems on the same partition is a recipe for disaster. If you installed XP in C:\Windows and Windows 7 in C:\Win7 (that's just a guess), then you might want to google for "two operating systems one partition" - I found some old guides on how to recover an operating system when two are installed on the same partition. The age of the articles/threads does not matter - the steps should work regardless of the operating systems involved.

In the future, remember this crucial step: always create a new partition for a new operating system.