said by Guru:It looks like I might've made a boo-boo :) but if I recall correctly, I had switched to c: but somehow it managed to give me error.
Not a biggie; what's important is to check the drive letter where the offline Windows directory is. The author's note about it 'usually' being the C drive is the opposite of my experience -- I'm dealing mostly with consumer OEM builds or clean, 'non-custom' installs, though.
The drive letter assigned to the offline Windows directory is rarely 'C' for me. Couple of examples are included here. The screengrab above is looking at a clean Windows 8 x64 install from the Windows 8 install CD in "repair" mode; the copy/paste text quoted below is from a WinPE 3.0 CD looking at an Acer OEM Windows 7 machine. In these cases, the offline Windows directory is on drive 'D', not 'C'.
Microsoft Windows [Version 6.1.7600]
X:\Tools>diskpart
Microsoft DiskPart version 6.1.7600
Copyright (C) 1999-2008 Microsoft Corporation.
On computer: MININT-DIMMTMN
DISKPART> list volume
Volume ### Ltr Label Fs Type Size Status Info
---------- --- ----------- ----- ---------- ------- --------- --------
Volume 0 F CD_ROM CDFS DVD-ROM 139 MB Healthy
Volume 1 C SYSTEM RESE NTFS Partition 100 MB Healthy
Volume 2 D Acer NTFS Partition 447 GB Healthy
Volume 3 E PQSERVICE NTFS Partition 18 GB Healthy Hidden
DISKPART> exit
Leaving DiskPart...
X:\Tools>dir C:\ /a
Volume in drive C is SYSTEM RESERVED
Volume Serial Number is B08E-B461
Directory of C:\
11/10/2012 12:43 PM <DIR> Boot
11/20/2010 07:23 PM 383,786 bootmgr
11/10/2012 01:04 PM <DIR> System Volume Information
1 File(s) 383,786 bytes
2 Dir(s) 75,362,304 bytes free
X:\Tools>dir D:\ /a
Volume in drive D is Acer
Volume Serial Number is 5290-A5B6
Directory of D:\
01/07/2013 04:13 PM <DIR> $Recycle.Bin
11/10/2012 01:08 PM <DIR> book
10/14/2011 02:10 AM 8,192 BOOTSECT.BAK
07/13/2009 09:08 PM <JUNCTION> Documents and Settings [C:\Users]
11/10/2012 01:36 PM <DIR> Dolby PCEE4
02/26/2013 02:54 AM 3,104,722,944 hiberfil.sys
11/10/2012 01:05 PM <DIR> Intel
11/10/2012 10:58 AM <DIR> OEM
02/26/2013 02:54 AM 4,139,630,592 pagefile.sys
07/13/2009 07:20 PM <DIR> PerfLogs
01/27/2013 06:27 AM <DIR> Program Files
02/06/2013 03:31 AM <DIR> Program Files (x86)
02/06/2013 03:39 AM <DIR> ProgramData
11/10/2012 10:56 AM <DIR> Recovery
02/08/2013 10:07 AM <DIR> review
02/22/2013 04:02 AM <DIR> System Volume Information
01/07/2013 11:54 AM <DIR> Users
03/19/2010 03:55 PM 2,073,703 VS_EXPBSLN_x64_enu.CAB
03/19/2010 03:58 PM 551,424 VS_EXPBSLN_x64_enu.MSI
02/06/2013 03:34 AM <DIR> Windows
5 File(s) 7,246,986,855 bytes
15 Dir(s) 224,921,772,032 bytes free
X:\Tools>