Windows 7: Removing XP from Windows 7, Ubuntu triple boot

Hello,
I have installed windows 7 on a different partition without removing windows xp. Now, I am having trouble removing windows xp from my windows 7, ubuntu boot. The problem is when I try to delete the partition, it keeps telling me:

"Delete is not allowed on the current boot, system, pagefile, crashdump or hibernation volume."

Here is my Disk Management:
[ ] Simple Basic [ ] Healthy(Primary Partition) -> Linux
( C: ) Simple Basic NTFS Healthy(Boot, Page File, Active, Crash Dump, Primary Partition) -> Windows 7
( D: ) Simple Basic NTFS Healthy(System, Primary Partition) -> xp
( E: ) Simple Basic NTFS Healthy(Logical Drive) -> for data



In boot manager, I only have one boot entry "Windows 7" because I removed windows 7 and ubuntu from it using easybcd (i use grub for all). Even if the Boot is written for Windows 7 in disk management, I don't have bootmgr and boot/ in my Windows 7 partition. It's in winxp partition. EasyBCD keeps giving me error "The boot configuration data store could not be opened. The system cannot find the file specified.", so i have to manually refer to the BCD file located in winxp partition.

What should I do to remove windows xp?

Thanks,
Kasya

It says it is the system partition. Thus the Bootloader for windows 7 resides on it. You can delete the Windows folder, and many of the other folders on the XP drive, but not the Boot - Boot Configuration Data (BCD) folder or many of the files in the Root of that drive - if you do, you may need to repair or reinstall windows 7.

While I was checking bcdedit, I found a command "bcdedit /createstore" to create a new store. Can I create it and remove the partition. If yes, how to remove the partition? I can do it from linux but is there a way doing it from windows (just curious)

Ok. I have run the System Recovery and it kind of recovered the boot. Now I have Boot/ folder with BCD file in my Windows 7 partition. But, my bootmgr is still in my winxp partition. Will moving it from xp partition to Windows 7 partition solve the problem?

C:\>bcdedit

Windows Boot Manager
--------------------
identifier {bootmgr}
device partition=C:
path \bootmgr
description Windows Boot Manager
locale en-US
default {default}
displayorder {default}
timeout 30

Windows Boot Loader
-------------------
identifier {default}
device partition=C:
path \Windows\system32\winload.exe
description Windows 7 Ultimate (recovered)
locale en-US
recoverysequence {abc9dfa9-52c3-11e0-9981-bf7baf9ea43d}
recoveryenabled Yes
osdevice partition=C:
systemroot \Windows

//It shows partition C: in both but bootmgr is in D:

Normally you would mark Windows 7 Active in XP Disk Management, boot the Windows 7 DVD or Repair CD to Startup Repair - Run 3 Separate Times. This writes the System boot files to the Windows 7 partition allowing you to delete XP in Windows 7 Disk Managment.

However all bets are off with GRUB in the mix. You can try making the Repairs but you may need to remove GRUB first. And be aware the GRUB can corrupt Windows 7 beyond repair just being on the same HD - we see it a lot here.

I'll change my main boot to windows, try and see what happens. Thank you.