If you had got your VIXIA HG21 unit without any Stylus NX515 driver CD or the latter is lost, you may choose to follow the links below. Without a special VIXIA HG21 driver to your unit, you won’t be able to use all its Epson functionality. The basic Stylus NX515 driver from Windows is only able to support the minimum Radeon HD3450 set thereof. You are really in need of a fully-featured authentic Stylus NX515 driver.
For VIXIA HG21 download, please just follow the Voltge A515960001 link.