Beef Wellington

Here is a recent one with me trying to modify a Bart CD. I tried to extract the boot image, modify the files on the CD, then burn with the original boot image. Same issue. I 11:42:56 Operation Started! I 11:42:56 Building Image Tree... I 11:42:57 Checking Directory Depth... I 11:42:57 Calculating Totals... I 11:42:57 Preparing Image... W 11:42:57 ISO9660 File System: 156 folder/file names have been modified due to your current settings. I 11:42:57 Checking Path Length... I 11:42:57 Contents: 1,280 Files, 30 Folders I 11:42:57 Content Type: Data I 11:42:57 Data Type: MODE1/2048 I 11:42:57 File System(s): ISO9660 (Bootable) I 11:42:57 Volume Label: BART I 11:42:57 Size: 177,013,853 bytes I 11:42:57 Sectors: 87,017 I 11:42:57 Image Size: 178,388,992 bytes I 11:42:57 Image Sectors: 87,104 I 11:42:59 Operation Successfully Completed! - Duration: 00:00:02 I 11:42:59 Operation Started! I 11:42:59 Source File: -==/\/[bUILD IMAGE]\/\==- I 11:42:59 Source File Sectors: 87,104 (MODE1/2048) I 11:42:59 Source File Size: 178,388,992 bytes I 11:42:59 Source File Volume Identifier: BART I 11:42:59 Source File Application Identifier: IMGBURN V2.5.0.0 - THE ULTIMATE IMAGE BURNER! I 11:42:59 Source File Implementation Identifier: ImgBurn v2.5.0.0 I 11:42:59 Source File File System(s): ISO9660 (Bootable) I 11:42:59 Destination Device: [1:1:0] HL-DT-ST DVD+-RW GSA-H21L 2.02 (X:) (ATA) I 11:42:59 Destination Media Type: CD-RW (Disc ID: 97m34s23f, Mitsubishi Chemical Corp.) (Speeds: 10x) I 11:42:59 Destination Media Sectors: 336,073 I 11:42:59 Write Mode: CD I 11:42:59 Write Type: SAO I 11:42:59 Write Speed: 1x I 11:42:59 Lock Volume: Yes I 11:42:59 Test Mode: No I 11:42:59 OPC: No I 11:42:59 BURN-Proof: Enabled W 11:42:59 Write Speed Miscompare! - Wanted: 176 KB/s (1x), Got: 706 KB/s (4x) I 11:42:59 Filling Buffer... (20 MB) I 11:43:01 Writing LeadIn... I 11:43:47 Writing Session 1 of 1... (1 Track, LBA: 0 - 87103) I 11:43:47 Writing Track 1 of 1... (MODE1/2048, LBA: 0 - 87103) I 11:48:34 Synchronising Cache... I 11:49:00 Exporting Graph Data... I 11:49:00 Graph Data File: C:\Documents and Settings\Administrator\Application Data\ImgBurn\Graph Data Files\HL-DT-ST_DVD+-RW_GSA-H21L_2.02_TUESDAY-JUNE-01-2010_11-42_AM_97m34s23f_1x.ibg I 11:49:00 Export Successfully Completed! I 11:49:00 Operation Successfully Completed! - Duration: 00:06:00 I 11:49:00 Average Write Rate: 606 KB/s (4.0x) - Maximum Write Rate: 640 KB/s (4.3x)

Following the guide here I've tried to slipsteam and create a bootable disc multiple times. However, when I try to boot from said disc I get error "CDBOOT: Couldn't find NTLDR" every single time. I've gone trough the whole guide and followed everything to the letter. Does anyone know what I could be doing wrong?