I'm having issues doing a clean install on this PC. It seems it comes with Windows 8 installed and another tech downgraded it to windows 7. I was then told to do a clean install on it and pulled the cd key with a program and installed Windows 7 Pro with a ISO I have. Now it won't activate the key saying it is invalid. I have the CDs coming from HP that I guess might help but I need this PC working today really. Is the key it pulled really a windows 8 key and just said 7 since that what was installed when I used the program to pull it? What are my options to get an active key?