just take the .exe files on a cd and upload and save and all there right?
I don't know how you mean here..But you take the unpacked exe files and extract the files onto her computer..
Make sure you inactivate/remove any previous firewalls/antivirus softwares if you install CIS.
This could very well be a configuration error as well, ex IP renewal as they said, if so you probably need to access her router (if she has one), usually by typing in 192.168.0.0 or 192.168.0.1 in her browser and alter some settings, if that is the case then its way to complicated or at least it takes too much time for me to explain anything, hope you solve it, I bet you do! =)
Got a paranoid theory too, maby those Comcast guys think your girlfriend is hot and they dissable her connection with the hope that she gives a call so they can hear her sexy voice..
Anyway, Have a nice day! I know I will. =)