My grand daughter has a Dell Inspiron 1420 with Vista. The original owner (her step brother) had the hard drive full. When it tried to update it locked up. I went into the Dell Restore and reloaded the system. It does fine except for one thing. It keeps wanting to download and install Service Pack 1. It gives an error Code 800F081F. I did some research on line and saw System Update Readiness Tool. That didn't help. What can I do? Please!