check MS official site. Download specyfic update and reboot into safe mode. This way you can run it without some services and it should go. If not then download CLEAN lastest win 7 and use it as OS- repair
You might want to give us a lot more info. We don't know anything about your PC or what you are trying to do. Also, please stop bumping your posts. Edit a post if you are going to give more info. This forum doesn't allow bumping.