All my icons dissappeared and the task bar!

I had a similiar issue happen to my computer. This happened on an HP 2000 laptop. The operating system is Windows 7. I noticed the problem over half an hour ago. It seemed to have happened after closing a program in task manager ("documents" and one of my open web browsers). Before this happened my computer was being really sluggish and my Norton anti-virus software was saying it was running a full system virus scan. Now all my icons and my task bar are completely gone as well as the norton notifications. Even the the start buttton is gone! I tried pressing Ctrl Alt Delete but the task manager will not come up anymore. I even right-clicked on the desktop but no options come up. The only thing that shows up is the last Internet window I have opened that I'm writing this post on. Once I close this window, I'm afraid my laptop will be rendered useless. I'm not quite sure how this happened and so far none of the solutions are working for me. Please can you Help!!!!!!!!