You can unlock all of the intel laptops automatically on the PC version of CoD4, but since you'll need to mess with your game's files a little bit, you're doing so at your own risk.

Simply go to your player profile (it will look something like this: C:\program files\Activision\Call of Duty 4 - Modern Warfare\players\profiles\player\YOURPROFILENAMEHERE), and search for a file called config.cfg.

Open the file by double-clicking it (or right-click it and open it in Notepad) and search for "cheat_points", minus the quotes, via the CTRL+F function. There will be a number next to cheat_points -- change it to "30" and all intel laptops will be automatically unlocked!