Help with corrupt ISdone.dll

I really need help from the you guys, cause it seems that all of the searchable isdone.dll related fix are just for windows 7 but my OS is windows 8.1. When going to cmd the steps dont work, it seems that it cant delete the previous corrupted file and cant register the new one from the system registry so i dont know anymore. I cant install a couple of files because of this and I cant afford to install a completely new OS - See more at: https://techcity.tv/forum/discussion/365/help-with-corrupted-isdone-dll#latest