I have recently changed to a new broadband provider and had to change my antivirus program. Every second or third time I start up my computer, the browsers won't open. If I close it down again and restart it, it usually comes right. When it does happen neither google chrome nor internet explorer 9 will open and yet I am connected to the internet and I can open windows live mail. It's very annoying and I can't see anything about such a problem on google searches. My laptop has windows 7 home premium and it is fine. It only happens on my mainframe which is running windows 7 proffessional. Anyone have any experience of this.