I do one of two things to verify if client software is installed. First, I fire up the registry editor (regedit) and see if there is a folder for HKEY_LOCAL_MACHINESoftwareOracle. If it is, then the registry has been populated for your Oracle sfotware. Looking in this folder, you should see many registry keys pointing to the directory where Oracle is installed. Then fire up Windows Explorer and navigate to that directory. Verify that there is software installed there.
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