When I am through browsing and close out the browser it does not close all the way, it appears closed but in order to close it completly I have to use the task manager to close it completly.

Since I have updated the browser and installed Yahoo messenger I have been having this issue of not being able to close Mozilla. If I close out the browser by X-ing out the page and want to re-open the browser I have to go into TASK manager close out Mozilla by end task then close task manager and re-open the Mozilla browser. I have already tried to UN-install Mozilla and re-install it but the same results.