Do you use the default aero, or any other custom theme ?
Your screenshot says that you are using a custom theme. Some themes have the feature of user pic disabling . So at first go to default aero again, and see whether the user picture is there or not ( I hope it will be there). If no, you may use an app that shows or hides the user pic, and icon rollover, accordingly. door2windows - Microsoft Windows Tip & Tricks, News, Downloads, Customization, Troubleshooting & More
BTW, welcome to th forums, pal