I just transferred my iTunes to a new computer (XP to 8.1). The transfer of music, playlists, etc. seems to have gone O.K. But every time I open iTunes I get the error message above with a warning that the certificate for the server is invalid and I might be connecting to a server pretending to be iTunes. I've tried to fix the problem using some suggestions I found on line (tweeking some things in Preferences), but the problem still occurs every time I open iTunes. Interestingly, my wife also made the same change from XP to 8.1 and she is having no problems with iTunes. Ideas, suggestions?