Dell Laptop; reinstalling windows 7?

I have a Dell laptop and have been trying to restore it. When I used the disk that came with my laptop, the stage 2 of installation froze up and wouldn't proceed further leaving me with no choice but to turn off my system. Since having done that, every time I turn my system on it says that I have to restart because of shutdown error or unsuccessful installation, and start from scratch. I have restarted my computer many times and I keep getting the same window. I have even tried safe mode and it just says that I can't install an os through safe mode. I am out of ideas and really don't want to have to take my machine to a shop.