merc. - if you got them via windowsupdate.com then you cannot save them. In that case your best option would be to create a ghost image of your fresh install with the updates and then use this as your reinstall process. click here for a guide to ghost.
Or you can download the updates from MS and save them locally to install at a later time. Maybe d/l them now and again when you have the free time.
Lastly, you can get SP1 from MS uk site free of charge on a CD.