Active partition not set after sysprep

I work in an organization that is using sysprep and ghost to currently create and deploy images. I'm currently working on an image that operates correctly until I try and unpack the image. The image is XP SP3.

The steps of importance are as follows:
1. Create image
2. Use sysprep to set options including enumerating drivers, etc.
3. Run sysprep.exe and use Reseal with mini-setup
4. Take offline image with ghost
5. Deploy to new workstation

Here is where the problem occurs. The hardware this image was built for has only 1 hard drive with only 1 partition, respectively C:. After the machine has the image deployed it gives a non system disk error. I verified that the hard drive modes are correct (IDE, sadly) and that the reference machine is operational still, which it is.

After viewing the partition table during my troubleshooting I noticed that the partition on the imaged machine isn't set as the active partition anymore, although it is the only partition listed. Once I changed the partition to active on the imaged machine, the sysprep file runs and everything works without issue. This can be repeated.

I have made numerous images and never run into an issue where the active partition is no longer set. Does anyone have a suggestion as to what might be the cause of this?

Here is the sysprep.inf that is being used for this image:

;SetupMgrTag
[Unattended]
InstallFilesPath=C:\sysprep\i386
OemSkipEula=Yes
TargetPath=\WINDOWS
ExtendOemPartition=1
OemPnPDriversPath=\drivers\8540p\aud;\drivers\8540p\blue;\drivers\8540p\cardr\83x32;\drivers\8540p\d rgrd;\drivers\8540p\mod;\drivers\8540p\turbo;\drivers\8540p\turbo\x32;\drivers\8540p\usb;\drivers\85 40p\vid;\drivers\8540p\wlan;\drivers\8540p\chip
UpdateUPHAL=YES
UpdateUPHAL=ACPIAPIC_UP,C:\Windows\Inf\Hal.inf
UpdateUPHAL=ACPIPIC_UP,C:\Windows\Inf\Hal.inf
DriverSigningPolicy=Ignore

[GuiUnattended]
AdminPassword=
EncryptedAdminPassword=
TimeZone=20
OemSkipWelcome=1
OEMSkipRegional=1
AutoLogon=Yes
AutoLogonCount=5

[UserData]
ProductKey=
FullName=
OrgName=

[TapiLocation]
AreaCode=
CountryCode=1

[Identification]
JoinWorkgroup=WORKGROUP

[Networking]
InstallDefaultComponents=Yes

[Branding]
BrandIEUsingUnattended=Yes

[Proxy]
Proxy_Enable=0
Use_Same_Proxy=0

[Display]
BitsPerPel=32
Xresolution=1280
YResolution=720

[GuiRunOnce]
Command0=

[Sysprep]

In order to have Sysprep work, you have to use the mini-setup instead of OOBE. In order to save your image, you can connect the computer's disk to another computer and follow this KB article (without the parallel installation part, of course): http://support.microsoft.com/kb/216684/en-us; this should make Windows boot normally when the computer is restarted, instead of running Sysprep (and crashing).

Sorry if I missed this in the initial post, but the mini setup is used in the process.