I tried and failed using a lot of the suggestions on this forum. I even tried logging in on a second computer to try to kick myself out of the game in the first computer so I wouldn't have to reboot. But both computers had the issue with only sound and no picture. I didn't get an error with either one about being logged in twice. So, knowing that there was a Microsoft update as well on Tuesday, I went into my Windows security and made an exception for the Guild Wars executable file, and I was able to log in and play. I don't know if this will continue to work, but worth a try.
I tried and failed using a lot of the suggestions on this forum. I even tried logging in on a second computer to try to kick myself out of the game in the first computer so I wouldn't have to reboot. But both computers had the issue with only sound and no picture. I didn't get an error with either one about being logged in twice. So, knowing that there was a Microsoft update as well on Tuesday, I went into my Windows security and made an exception for the Guild Wars executable file, and I was able to log in and play. I don't know if this will continue to work, but worth a try.