I re-installed again, I am using my own Win 7 disk, none came with the computer. This has always worked in the past. Now after installing my Win 8 disk and trying to download all updates, upon booting, it is showing a message that the downloads did not download correctly and is reverting.Whereas when I try to upgrade to Win 8.1 in Store, get the message that I need to install upgrades. Try again , same thing. Never happened before. Any ideas greatly appreciated.