Is this your first installation or did you have done already one? The error means that your datafile is corrupt, which happen to me when Oracle deinstall not remove all datafiles.
In this case try to reinstall with manual file delete.
If your problems persist remove de oraclexe 11gr2 from start>control Panel>add/remove programs.. Select Oraclexe 11gr2 and click remove. The unistallation process take only 10 minuts & the installation process 20 Minuts. Try, is the best way, garanteed than the installation will be succefully.