Install it on your current hardrive. You will have to reboot after installation. After rebooting, shut down your system and install your new drive. After bootup, click on the maxblast icon and decide if you want to clone your old drive, or simply format the new drive. Set up the new drive as a boot device. Then shutdown your system, disconnecting your old drive if you're not cloning it. Then power up with just the new drive connected and your windows dvd in your optical drive, and change the boot order in the bios to dvd>hardrive if needed. If you are using the same version of windows on both drives, you should be able to connect your old drive while the new drive is running windows and windows will configure it to the secondary drive automatically.