the operating system has already been installed on a previous computer and then i just took the harddrive out and put it on the emachines. does anyone know what the HELL is going on?!?!.
What is going on is that it ain't gonna work.
The OS (Windows) was installed on a different machine, in a different set-up, with different components. Windows checks these things, and if they don't match (different mobo, for instance), it just won't work.
There is probably a registry hack for it, but I don't know it. You'd have to use a Knoppix CD, or install the drive as a slave in a different computer to access it, anyway.