A friend's Acer laptop running Windows Vista Home Premium SP2 cannot update itself because of error 80070490. Having googled on this I found:
So far I have run system file checker, and it came back with errors it could not fix. I also ran System Update Readiness tool, which did not fix it, so I appear to be left with an upgrade install.
As this is a laptop, it does not have a Windows Vista DVD, only an option to burn recovery disks. I have a Windows Anytime upgrade disk, which I tried to use, but the Upgrade option was unavailable. What is the best way for me to run an upgrade install to try and fix this problem.
I tried to run appwiz to remove SP2, but search could not find appwiz, and no MS updates are listed in Programs and Features.
Any help appreciated, thanks.