The local community centre has 4 windows 7 pro systems that need reformat and reinstall. They have lost their install media but the systems all have their coa stuck on them. I have an oem home premium disk but would this work to install pro? I did read somewhere that it was the licence that determines the version. I have also done some research and on the windows 7 forums they mention a site that has isos available for download. The site is www.mydigitallife.info has anyone heard of this site? Is it reputable.