Hi My favorite is the W7 system repair CD. There are ton's of them. What's your favorite and how do you use it?? I use this to get to the W7 rescue features. I can't get to them on my model through safe mode, so i have to have this CD. Also good to have if your system won't boot.
http://windows.microsoft.com/en-us/windows7/create-a-system-repair-disc
http://windows.microsoft.com/en-us/windows7/create-a-system-repair-disc