tested on windows 10 1155 as well as the prior rtm release and it says the keys have been blocked. i tried a number of them. this machine came with windows 7 x64 home premium but the tag on the bottom has been mostly worn / torn away so i no longer have the dell lic key. windows 7 was fully activated and passed genuine test then when installing windows 10 (either build) it does work, with the 1155 i get the key is not digitally entitled and with the older rtm i get the key has been blocked. i tried with both dell keys as well as a few others. any ideas?