If you ave two different systems (a Dell something or another and an Alienware which is also a Dell) you should get each setup the way you like/want and you can create an image of each using the free version of Macrium Reflect:
Free Macrium Reflect
It is extremely unlikely that you will be able to have one image that will work on two different systems with different hardware. Each machine will need to have a separate image.
The image you make for your Dell is not the one you want to restore to your Alienware and vice versa.
If you want to get rid of all the bloatware and other stuff I would perform a clean/fresh install of Windows 7, get it updated, install and configure all your third party applications you want/need and when it is just right create the image.
OEM systems where Windows comes preinstalled from the factory generally do not come with Windows installation media so you will need to create some.
I would not attempt and it may not be possible to store your good image on a CD/DVD or several CD/DVDs - that is a risky strategy. If you ever do need the image that might work and it might not work. It makes more sense to store your images in separate folders (one for each system) on an separate external hard drive - not the same drive and the installation itself.
Over time you may add/change things and then you can periodically create new images and keep maintain as many images as you want going back in time as far as you want.
If your system crashes or becomes unusable someday and you need to recover it to one of the saved images how are you going to do that?
You should create some recovery media (a bootable CD/DVD or USB thumb drive), pretend your system has become unusable and you need to restore one of your images.
Are you able to boot on the recovery media and access the system images you previously made and saved? You don't have to "do" anything... just be sure your recovery media boots and it can access/find the system images you need.
And each system will probably need it's own bootable recovery media. What works on your Dell probably will not work on your Alienware.
The day you need to recovery strategy to work is not the day to find out your recovery strategy doesn't work.