Hi Kandie, I am not sure. Have them redownload it. My EUOX build says 290 as well, but it works on the client 7.0.46.0, which I believe is the latest patch. I tested it and my euox build works. So also make sure they are running in administrator mode as well. A virus is unlikely unless they are visiting shady websites. EasyUO should be clean. I've never had any problems with its integrity.