msn 7.5 problem or XP problem?

Have got XP Home and as there are three of us who use this computor we all have our own accounts and private passwords. We also have a general family account. In the family account we can all sign into and use with out problems messenger 7.5. When I made my own account only 'windows messenger' was loaded. So I downloaded msn messenger 7.5, it runs ok but the icons and emoticons are in a black square! If I or the person I am talking to use emoticons in coversation window - they too appear in a black square.

Also when I log into my account, 'windows installer' appears and does its thing and then a repair wizard for messenger does the same thing. Same happens if I log out from my account and into the family account. But only if I have been into my account then go to the family one. I have deleted and re installed messenger twice in my account.

Any help or advise gratefully recieved!