A few months ago I purchased a refurbished laptop from Best Buy online. When the computer came, I simply started the computer and entered the product key. But a few days ago my computer caught some sort of virus so bad that the only solution was a system restore. The problem is, when I recieved the laptop, it did not come with the actual Windows 7 installation disk, just the product key. Now on the boot menu it asks that I instert the disk and enter the key. Does this mean I have to ho and spend another $100 - $200 on the OS even though it was included in my system? How can I fix this?