MissyDK, It sounds like your Luna Theme, which is the XP Theme is missing. Go to the link below and under the letter "T" scroll down to "Themes (Won't Load or only Windows Classic is listed)" and you'll find several possible solutions. (Restore Luna Theme (Line 187)).
Hi! My husband decided to change the theme of our computer to something ugly and annoying, when I went to change it back using the Display Properties menu the XP theme wasn't on the menu anymore.
Does anyone know how I can get the original themes back on my computer? Thanks!!