If you are saying that when you open word it opens this letter. If this is the case the letter has been saved as normal.dot.
In Windows XP Click on my computor
click on your C drive.
Click on search.
Click on all files and folders.
Click on the arrow next to more advanced options and make sure hidden files and folders is ticked.
At the top enter normal.dot then click on search. When it has found the file click on it using right mouse and sellect delete. When you open word it will be a blank sheet.
If you are talking about the information stores in the address bar and if you are using IE7 go to tools/Internet options/general and sellect delete at the bottom sellect delete all this should clear everything in the address bar.