That's the slowest speed your burner/firmware/media combination allows, besides, burning 8x rated media at 2.4x doesn't usually result in good burn quality.
That's open to interpretation and varies wildly depending on your country's laws.
Anyway, there are plenty of tools for doing what you want and ImgBurn, nor its author LUK, aren't looking for legal disputes
Try burning at 4x or 6x. Also look for the latest chipset/storage drivers for your system (this website might help). You could also try with high quality media such as Verbatim and Taiyo Yuden blanks (laptop burners are rubbish so good media is a must).
Als ik het goed begrepen, de nieuwe ImgBurn is niet het probleem. Misschien is de brander moet worden schoongemaakt met een schoonmaakmiddel schijf, en het zou ook helpen om een hoge kwaliteit media gebruiken zoals Verbatim en Taiyo Yuden merken.
(Google Translator again)
ImgBurn burns stuff as is, i.e. it doesn't change anything, so if you want a slideshow/movie/etc disc then you'll need to use another program to author such disc and then you can use ImgBurn to burn the disc.
Seems like your system is having memory problems, so test it with memtest86+. Also, since it looks like it's a laptop, make sure all ventilation holes aren't blocked.