from this link..
http://uwadmnweb.uwyo.edu/ASKIT/faqs...icescanfaq.htm

under the title "Why does OfficeScan prompt me for a password when it is uninstalling? "

you'll read this.. I hope it helps..

OfficeScan contains an undocumented bug, where an uninstall password is sometimes required. The problem occurs when the OfficeScan client cannot communicate with the server to determine if an uninstall is password protected or not. The client application resorts to using the initial password set for the OfficeScan Management Console during the server installation process.

If you initially installed OfficeScan 3.x, the uninstall password is newHouse (note the capital H).
If you initially installed OfficeScan 5.x, the uninstall password is password.