Cobras

I print mailing envelopes using Word 2003. When I type in my address (sender's address) , the address remains there for millenium:-) When I started to use CCleaner, it deletes sender's address. So I got to type in my address every time I clean my computer using CCleaner. Please advise me how I can avoid this problem. My OS is WinXP SP2 with Microsoft Office 2003. Cobras