Your burner is too old and doesn't support the newer media you're using. You could try finding older 8x rated media to see if it'll work or you'll need to get a new burner, which is quite cheap these days.
Update ImgBurn. Look for the latest drivers for your system's chipset/storage controllers (this website might help).
After doing that and rebooting, insert a blank disc in the burner and, with ImgBurn in Write mode, copy and paste here all the media information text shown in ImgBurn's main window.
ImgBurn relies on the information provided by the burner, and in your case...
Your drive reported the disc as having 295,232 sectors (~600mb), when it usually should report 359,844 sectors (~703mb). I would guess it's because it's too old.
Try cleaning the drive with a lens cleaning disc, or even manually if you know how to do it. If that doesn't help then you'll need to use/buy another burner.