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Follow all deinstall steps (for Windows) at http://docs.oracle.com/cd/B25329_01/doc/install.102/b25143/toc.htm#CIHDDHJD
How can i entirely clear the express edition(10g)
An XE installation only allows one instance per host, so if another XE setup is found- services, database instance, anything at all all, the installer will balk.