Is it possible to save to DVD or Ext HDD all the updates to XP since SP2.? I frequently have to go back to the original as shipped setup and my PC then spends ages connecting and using up broadband time downloading them all again. Are they somewhere on the PC ?
Go back to the original shipped setup, install all the updates etc. and once you're happy with the way your PC is, use Norton Ghost (or something similar) to clone your hard drive.
That way you can revert back to this snapshot rather than reverting back to the shipped setup.
If you then subsequently install more updates, delete the old clone file and create a new one.