[TheMamba]

To take the existing drive out...you'll need to get at it from the front of the case. Don't even think of fucking around with taking the motherboard out.

First, turn the computer off. There should be 2 cables going to the existing drive - a power chord (red, yellow, black wires) and the IDE cable (flat and wide). Unplug those.

To actually take the drive out...look really closely at the front of it. On each side of the drive there should be 2 metal tabs. These are kinda spring loaded. You need to push both of them in at the same time while pulling the drive out. (I'm trying to take a picture of them on my computer but I can't get it to come out very good...but I will keep trying).

Once you get the drive out...you'll see that these metal tabs are attached to the side of the drive with screws. Simply unscrew these to unattach them and then install them on the BenQ drive.