"7Burn Free Burning Software (SevenBurn) is designed to work properly under Windows® 7 operating system through IMAPIv2 that enables to use any support for writing discs including Blu-Ray.

IMAPI2 is not supported on old systems but in some cases you need to install this update: Description of the Image Mastering API v2.0 (IMAPIv2.0) update package that is dated June 26, 2007

7Burn addition to writing any file on any media has a tool for creating and writing image files in various formats and Erase RW discs."

7Burn | Free Burning Suite | RCPsoft.net

2 flavours; installer and portable.