Few things I can suggest.
1. Verify if you have registered the dll properly using regsvr32.exe
2. Check if the path 'E:\bea\weblogic92\server\bin' appears in the path
string on your weblogic server server console. you can search for 'PATH = '
3. If it doesn't appear there, modify your setDomainEnv.bat to accomodate this path.