No, I don't think this is a virus or anything. BotScout (a program that helps identify spamming bots vs. real people on the forum) has been giving several users issues lately, and Raz has been wrestling with trying to figure out why exactly it has been blocking some from making new accounts.
I'll bring this to his attention, since it seems to be acting up again. If he can look into it tomorrow, he may be able to fix it, but if it's been a few days and you're still getting the same issue, feel free to send me a PM and we'll see what we can do.
So sorry for the inconvenience, and thanks for your patience, Koori.