History: I am not sure if this info is urgent, but... About a year ago, I have purchased a laptop with installed Windows 8 on it (probably Core Edition, but I am can not remember). I have formatted laptop's HDD, and then installed Windows 7 on it (which was been activated by using one of popular loaders). While using installed Windows I have experienced some problems with drivers so I have installed Windows 8 back, by using MSDN installation disk image (and again, I did not remember, which edition I choose). If I remember carefully, Windows has been successfully activated automatically, and I have no any problems then. Then I moved on Linux so I erased my HDD again... Questions: I want to use activated Windows 8.1 in virtual machine. I know that I can install Windows 8 on VHD (with provided ACPI tables) and then upgrade to Windows 8.1. I want to know: Are there possibility that I will experience a some activation problems with Windows 8 in future when installing it on my laptop? Are activation will be successful? Can I repeat this process? If so, then how many times? P.S.: I'm sorry for possible errors, English is not my native language. Hope that this question did not violates any of forum rules.