I’ve acer aspire laptop and I’ve installed a windows 7 operating system in my laptop. Till yesterday my laptop is working in good condition, I’ve checked all the drivers and application on yesterday all are working fine on yesterday evening I’ve installed a antivirus software and it was working good but next day when I start my laptop my laptop get stuck on the startup screen. The first screen that came up is “acer empowering technology” and at the bottom of the screen it shows ‘press f2 key to start setup’. After that I can’t able to continue my startup and my laptop stuck. I don’t know what is gone wrong with my laptop. Please tell me what to do, how to resolve this problem. Please give your suggestion on this. Please help me.