It doesn't matter that you just paid a thousand dollars for a machine that comes with a valid Windows 7 license - your computer manufacturer just don't want to spend the money (or perhaps take on the responsibility) of giving you a Windows 7 installation DVD to accompany your expensive purchase.
The problem is, with Windows 7, the installation media serves more than one purpose. It's not just a way to get Windows installed, it's also the only way of recovering a borked installation. The Windows 7 DVD has a complete "recovery center" that provides you with the option of recovering your system via automated recovery (searches for problems and attempts to fix them automatically), rolling-back to a system restore point, recovering a full PC backup, or accessing a command-line recovery console for advanced recovery purposes.
Thankfully, Microsoft seems to have realized this problem, and have thankfully made a recovery disc for this purpose. It contains the contents of the Windows 7 DVD's "recovery center," as we've come to refer to it. It cannot be used to install or reinstall Windows 7, and just serves as a Windows PE interface to recovering your PC.
Download: File ISO