Here is my log.
I 00:15:53 ImgBurn Version 2.5.1.0 started!
I 00:15:53 Microsoft Windows 7 Professional Edition (6.1, Build 7600)
I 00:15:53 Total Physical Memory: 3,406,904 KB - Available: 2,263,676 KB
I 00:15:53 Initialising SPTI...
I 00:15:53 Searching for SCSI / ATAPI devices...
I 00:15:53 -> Drive 1 - Info: ASUS DVD-E818A3T 1.00 (K:) (ATA)
I 00:15:53 -> Drive 2 - Info: LITE-ON LTR-48246S SS0A (H:) (ATA)
I 00:15:53 -> Drive 3 - Info: Optiarc DVD RW AD-7220A 1.01 (I:) (ATA)
I 00:15:53 -> Drive 4 - Info: TSSTcorp CDDVDW SH-S223F SB00 (J:) (ATA)
I 00:15:53 Found 1 CD-RW, 1 DVD-ROM and 2 DVD±RW/RAMs!
So this is what happens. I start ImgBurn and it takes a little bit to pop up. Once it comes up, I select "Write image file to disk." Next I choose the source. I am working with two kinds of image files, .nrg (Nero), and .gi (Roxio). If I select either image format, I get the error message that says "Invalid or unsupported image file format." I have not been able to find anyone in the forum with the same problem. I used to be able to write to discs with either image using ImgBurn. If anyone has some suggestions let me know. Thanks.