I have downloaded DIAG_MATS_NETWORK_global.Diag.Cab but cannot find out how to run it. Can only partially clean boot. I am wondering whether to give up and reinstall Windows, but very reluctant to do so because this is a 5 year old PC and all the drivers and programs on the original CDs will be outdated, plus losing settings etc. I can log in as Administrator. However, even that will not allow me to do a totally clean boot. I do have a functional, Windows 7 Notebook PC and have at least managed to tranfer most things to it. However, I really want to rescue my old desktop PC.