This is what I have listed in my log...as you see i tried both .iso and .dvd files i had
I 08:55:33 ImgBurn Version 2.4.2.0 started!
I 08:55:33 Microsoft Windows Vista Home Premium Edition (6.0, Build 6001 : Service Pack 1)
I 08:55:33 Total Physical Memory: 2,086,176 KB - Available: 867,432 KB
I 08:55:33 Initialising SPTI...
I 08:55:33 Searching for SCSI / ATAPI devices...
I 08:55:33 Found 1 DVD-ROM and 1 DVD