That the whole point of slipstreaming
You create a new folder on your C:/ Drive and in it you can put any combination of the following: 1) operating system
2) Service pack 2
3) all remaining Microsoft critical updates to include KB958644
4) Each of the Secuity apps you use
And then: using "nlite" downloaded from the GeekGirls site you create a "SlipStreamed" installation disk which when successfully created allows you to download/install all of the above from your "SlipStreamed" installation disk without having to venture online until your computer is totally protected to your satisfaction.
So now when you wish to do a clean install on that system you have everything on the one disk and you treat it as your installation disk and when you are all done you simply connect to the internet and go from there. You are already up to date
You accomplish two things; You are already protected before going online and you can do a complete windows re-install very quickly instead of hunting and pecking all over the internet for the items you need to do such a re-install.
Go here for your microsoft Service Pack downloads and critical updates: http://support.microsoft.com/
you can find everything you need there for what it is you are looking for.