Sounds like an issue with the driver for the optical drive.
Is the laptop 32bit or 64 bit. Are you doing a clean install or upgrade.
You can't move a 32bit installation to 64bit.
If upgrading what version of Windows in on already.
I upgraded a Toshiba Equium only last week, and had not a single issue.
You must make sure you are using the right version of Windows 7 to match the laptop you are installing to.