Dual boot win7 x64 and winXP x86

Hi all
I have a bit of a problem with my drives..

I've been running win7 x64 for a while, but needed winXP x86 for some older apps.
So I installed XP on a different partition on another drive - Install went well but messed up my MBR pretty bad.
I used the bootsect tool in commandline on the DVD to make win7 work again. But I couldn't make the XP work..
Then I took out the drive win7 is installed on to reinstall XP on the other disk.
That went fine so I had a working XP but only when the win7 drive was not connected.
I reconnected the win7 drive and booted up the install/repair win7 from the DVD - I was prompted to repair win7 so I did (not in command line - it was a dialog box)
So now I'm thinking great, win7 will work again. But no... XP booted up, but this time with the win7 drive connected

As i browsed my drives to see which have some "boot files" on them I discovered a total mess! 3 partitions have boot files on them and I'm not sure which it uses.
I'm really confused as to what action I should take to make it all work as intended (What I want is a dual boot menu at startup)

I've attached a screenshot from the disk management tool in XP to give you an idea of what I'm up against

(partition F: has the XP install - C: has "boot files" - L: and D: are fine and have no "boot files" - E: has "boot files" - H: and J: is the win7 install)

I really hope some of you understand what I'm talking about, and any help will be much appreciated!

Thank you all in advance.

Wow that was quick!
Thank you - I'll look into this at once.
It makes a bit more sense now - the OS installer chooses the first connected SATA HDD as the "Active" partition and installs windows on the same drive, but another partition ("system") - correct?

I do however have some additional questions:
At what part during this process is it safe for me to reconnect my other HDDs?
Am I to do this repair process 3 times for every HDD I reconnect?

Thanks again.

Ok.
So I detached and rearranged the drives on the mobo and ran the startup repair. No problems were found though, so I restarted and was presented with the option to select which OS to boot, great!
Win7 started just fine, so I restarted to try out XP, but I got an error message stating that \system32\ntoskrnl.exe is missing. I tried the startup repair agian, but still got no problems were found.

Can you post a new screen shot of Disk management from Windows 7?

XP Repair Install

I did. Here is a new screenshot of what the disk management looks like now.
I read somewhere else that my bootloader might point to a wrong disk/directory - I havn't tried to change it, but this it was it looks like according to "easyBCD":

There are a total of 2 entries listed in the bootloader.

Default: Windows 7
Timeout: 30 seconds
EasyBCD Boot Device: E:\

Entry #1
Name: Windows 7
BCD ID: {current}
Drive: C:\
Bootloader Path: \Windows\system32\winload.exe

Entry #2
Name: Microsoft Windows XP
BCD ID: {1b491c6a-8ed1-11df-a689-c5f37a34bebe}
Drive: C:\
Bootloader Path: \NST\ntldr

You'll need to install EasyBCD 2.02 to Win7 to delete the current XP listing on Edit OS tab, then add XP on the Add OS tab: accept offered boot files, let it autocomplete, Save, restart. Welcome to EasyBCD The NeoSmart Files

If this won't work then boot free Partition Wizard bootable CD to rightclick XP on D>Modify>Convert to Primary, OK. Next rightclick on E & H data partitions incorrectly marked Active to Modify>Set to Inactive, OK, Apply all Steps. http://www.partitionwizard.com/download.html

Next unplug Win7 HD and run a Repair Install on XP with it set first to boot in BIOS setup. Repair Install

After Repair plug back in Win7 HD, set it first to boot in BIOS setup, then when you need to boot XP use the one-time BIOS Boot Menu key given on first boot screen, normally F8, ESC or DEL on Asus'.

This BIOS Dual Boot method keeps the HD's independent to come and go as you please. If you prefer a Windows-managed Dual Boot which will interlock the HD's, install EasyBCD 2.02, delete any existing XP listing on Edit OS menu, then on Add OS tab add XP, accept boot files, let it autocomplete, Save, restart.