You don’t need to delete this entries for a fress install.
It won’t be so easy to delete this legacy keys. Maybe you may have to boot at ‘Safe Mode’ or try to get the permission to delete these keys with Registrar Lite: Menu Security > Edit permitions.
Anyway, I advice you let this keys and the others there where they are. This part of the Windows Registry is particulary sensible to mess changes. TAKE CARE! With Windows 2000/XP you must do a complete recoverable backup with Emergency Recovery Utility.