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.