I reformatted my hard drive the other night and put OS 8 back on. I was kinda of wondering if I would get OS 8.1 upgrade back in the Windows Store. It was not appearing there. I finally found the answer, a KB file was needed to be added to my registry to get the upgrade to show up in the Windows Store. While I certainly wish there would be this upgrade on a cd (for other reasons too), it does work, and that's what counts. For people with fast internet access, it is certainly workable. But, for those who do not; it certainly is not a great answer. And I wonder what these people are supposed to do? Also I have been very curious as to how I might be able to upgrade my Windows Home 8 version to Windows Pro 8, since this version is an OEM. I know the serial number for it but, will Microsoft accept it? Have not run across any info on this one yet. And have not been able to confirm whether this upgrade can be obtained on disk or not?