Posted October 15, 200717 yr Currently running XP Home Ed. Sp2 Wanted to repair my installation, but inadvertently hit clicked to upgrade. My computer is now stuck in a loop and won't complete the upgrade. I get a message that the signature is invalid and error 426 and it halts and reboots to the same place. The installation requests files that are not on the reinstallation cd that came with the computer. How can I terminate the upgrade?
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