On opening a website url on Deskbar configured in Windows Vista, I am getting a warning message. The message says that do you want open the file. It appears even if I open my email url. It is very annoying and I am looking to find a way to stop this completely. I am using Windows Vista, with Avast installed in the same. Does it is causing the issue. I had scanned the system and do not found any infection. The url belongs to an office site url. I had spoken to my office IT guy he said it is a safe site. So why does it is giving as a security threat on my system. How can I stop that.