ok, i spoke too soon. it was working, until
I 01:46:24 ImgBurn Version 2.4.2.0 started!
I 01:46:24 Microsoft Windows XP Media Center Edition (5.1, Build 2600 : Service Pack 3)
I 01:46:24 Total Physical Memory: 3,144,924 KB - Available: 2,641,160 KB
I 01:46:24 Initialising SPTI...
I 01:46:24 Searching for SCSI / ATAPI devices...
I 01:46:24 Found 1 DVD-ROM and 1 DVD