re: have a problem with Windows Explorer

Hello I have a problem with Windows Explorer. I uninstalled Nuts&Bolts98. I am now getting problems like Windows created a “unknown” default and will close. Although I have finally got my graphics back to normal, I want to install Windows 2000 Professional but am afraid to do so b/c I believe Explorer will keep me from installing Windows 2000. Should I go ahead and install? If so please let me know or what ever I have to do to fix this problem to install Windows 2000. Thanks ~Scott~