Are you using the Samsung Windows 7 Reintsallation DVD, or Recovery DVD's you've made?
If you have wiped the Samsung Recovery partition then Recovery won't work any longer by any method for some Samsung models. They require the software to be reinstalled at cost.
It's better at this point to clean reinstall Windows 7 from an Installation DVD which we can help you find if you need one and give us the licensed version on your COA sticker.
If you have an Installation DVD, what exactly is the error and when does it happen? Clean Install Windows 7
If you cannot boot the DVD, reset the BIOS to defaults in BIOS setup, then set DVD drive first to boot.
Now boot the DVD, wipe the HD with Diskpart Clean command and click Install Now.