SQL Developer 1.5.5 installs but won't connect to Oracle DB

An earlier version I'd been using for years just went dead on me, nearly crashing my PC in the process.
I installed 1.5.5 with its own JDK, and it launches without errors, but when I try to create a new connection, it gives me this crap: "no ocijdbc11 in java.library.path".
A perfect example of a completely useless error message. What's a "java.library.path"? Where is it? How do I fix it?
I couldn't find any uninstall utility for SQL Developer, so I just deleted the 'sqldeveloper' directories for both versions and re-installed. Same result, same useless error message.
I thought I might try this forum while I'm installing TOAD. Any suggestions? Anyone seen this before?

If you're using TNS, try using the Basic connection type.
If that still doesn't work, you can try tricking sqldev by changing your ORACLE_HOME within a batch file inside sqldev's install folder. This would force using the supplied thin driver:
set ORACLE_HOME=%CD%
start sqldeveloper.exeHope that helps,
K.

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