I am using Dell Inspiron 545 PC. I worked on IE7. When I used that I could not open multiple windows. So that I have to worked on one site at a time. If I can open multiple sites at a time then time requires to complete my work is less. I thought that there is problem due to virus so that I installed avast anti virus. But it didn't help me to correct the problem. I don't want to change my browser so give some suggestions.