I have a acer laptop with windows 7 starter operating system. It's a laptop I bought from my boss then six years ago. I decided to reinstall windows since the computer is extremely slow - can't scroll down pages and can't open a file without it going into a "not responding mode" etc... When I bought the laptop I only got the laptop and the charging wire - nothing else - no CDs I have a product key on a sticker at the bottom of my laptop. When I enter it to verify before reinstalling I get the following message: "Error: The product key you entered appears to be for software pre-installed by the device manufacturer. Please contact the device manufacturer for software recovery options." I now have no idea what to do. I do not have technical expertise but I can follow through directions really well. Please help resolve this.