It's not actually a DownloadStudio question, but I couldn't find any other section in this forum to post it.

why my Private messages inbox is filled with Virus Alert messages?
There's a Notifictions link above this page which clicking it, will take me to my received private messages.
To my surprise, it's filled with messages that tells me my PC is infected and asks me to download some exe files to remove these viruses.

And a lot more commercial messages.