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First off, please make sure the versions of SQL Developer and Java SDK match in terms of bit-architecture, either both 32 or both 64. You can explicitly control the Java SDK that SQL Developer points to from the ...\sqldeveloper\bin\sqldeveloper.conf file. As for the missing dll, if it should still be a problem, try finding it in your Java SDK install and copy it to the same directory as sqldeveloper.conf.
Keep in mind you can install as many versions of the Java SDK as you wish on your machine and switch between them as desired using the conf file, as noted above.
SQL Developer Team