I would first suggest that you choose a supported configuration for Oracle. Oracle 8i is not certified to run on Win XP. The first server release certified for XP was 9.0.1. Check the certification matrix on Metalink to be sure.
If you continue to have problems with a supported, certified configuration, then I'd suggest recreating the database using the database configuration assistant.
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Related Q&A from Dan Norris, Year 2004-2005
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