Text in winxp is scambled

Has anyone else seen xp when booting up completely scrambles all of the text? What I mean is the text in the logon screen to the program file listings would be scrambled to the point that they look like something that you would see in the Character Map listing called WINGDINGS 3. All of the text has changed to symbols, arrows and or computer language. If any one has seen this please let me know what makes?s this happen. Thanks
Steven scc2657@charter.net