If you are running anti-virus real-time shield software it's not uncommon for it to interfere with how the system functions. Imgburn has been around for quite awhile and has a top notch reputation. If it shows as malware and you downloaded directly from the Imgburn site, then the av software may be the problem.
edit: it may be worth an experiment. If you have real-time av protection running, turn it off just long enough to try burning a disc. If everything works then that would indicate it's not letting the burning software properly access the hardware.