(Can't see my previous reply, please disregard if duplicated)
As a control, I burned the same project in my laptop which runs XP and the result was flawless.
The log below corresponds to the bad results on my desktop running Vista.
I 17:41:36 ImgBurn Version 2.4.4.0 started!
I 17:41:36 Microsoft Windows Vista Home Premium Edition (6.0, Build 6000)
I 17:41:36 Total Physical Memory: 3,142,796 KB - Available: 1,925,880 KB
W 17:41:36 Drive G:\ (FAT32) does not support single files > 4 GB in size.
W 17:41:36 Drive N:\ (FAT32) does not support single files > 4 GB in size.
I 17:41:36 Initialising SPTI...
I 17:41:36 Searching for SCSI / ATAPI devices...
I 17:41:37 Found 1 CD-R, 1 DVD-ROM/CD-RW and 1 DVD