Hi guys, I've a HP desktop that comes with Vista Business. Recently, the system prompt me for Activation. I then keyed in the Vista key found on the COA sticker. However, the system prompts me that the key i've entered is invalid. After which, the system ask me to activate via the automated phone activation. I provide the system with my installation ID, but the system says it's invalid. How can i going to solve this? Does this means that I'll have to reformat my system? Thanks