Sorry this is so long but here is one of the logs (thanks for all your help!!)
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; ImgBurn Version 2.4.1.0 - Log
; Monday, 07 July 2008, 17:33:56
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I 08:54:33 ImgBurn Version 2.4.1.0 started!
I 08:54:33 Microsoft Windows XP Home Edition (5.1, Build 2600 : Service Pack 3)
I 08:54:33 Total Physical Memory: 2,086,992 KB - Available: 1,502,152 KB
W 08:54:34 AnyDVD can interfere with ImgBurn's ability to verify accurately, please ensure it's disabled!
I 08:54:34 Initialising SPTI...
I 08:54:34 Searching for SCSI / ATAPI devices...
I 08:54:34 Found 1 DVD