Just let’s check you did the install [I][U]without[/U][/I] the scanner attached…? If that still doesn’t work, then you can try installing the scanner drivers once again to your Win7 machine under XP compatibility mode.
Basically: Uninstall the scanner drivers you already put on on your Win7 laptop. Then put the scanner driver CD back in, look for the [I]setup.exe[/I] or [I].msi[/I] install program on it; probably this will be in the root directory. Then right-click the icon, select properties. Under the ‘Compatibility’ tab, choose ‘Windows XP’ (or "Previous version of Windows).
Then off you go.