Have installed 11g in Windows 7 (64 bit machine). Since the SQL developer wont work with 64 bit jdk.
Installed the 32 bit jdk1.7.0
and changed the ORACLE_HOME\sqldeveloper\sqldeveloper\bin\sqldeveloper.conf file SetJavaHome point to 32 bit jdk1.7.0.
Again started the SQL developer, but it throws msvcr100.dll missing. Find that the SQL Developer3.x supports at max jdk1.6.X.
These information is specified in ORACLE_HOME\sqldeveloper\releasenotes . So install the jdk1.6 and make the sqldeveloper.conf SetJavaHome point to this.
other workaround is go to jdk1.7.0 installed path jdk1.7.0\jre\bin copy msvcr100.dll and paste it into ORACLE_HOME\sqldeveloper\sqldeveloper\bin and again try start SQL Developer. It will start.
And The file is from
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