I am not sure if it is possible to do it on XP but this is what I do on both Win 7 and 8. Perform the last update and clean up your XP installation and clone it to another HDD (Try Macrium Reflect Free for cloning. I don't know which one works for XP). Use the cloned one on your PC and keep the original "clean" installation (with all your programs installed) as a back-up that you can re-clone again when problems arise. But you have to make sure that the HDDs are of the same capacities as trim is not supported on XP.