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.
Even tho the question is answered I would like to point out that downloading random DLLs from untrusted sources should be avoided.
If you are missing MSVCR100.DLL just install the correct redist for your platform.
32Bit: Microsoft Visual C++ 2010 SP1 Redistributable Package (x86) http://www.microsoft.com/de-de/download/details.aspx?id=8328
64Bit: Microsoft Visual C++ 2010 SP1 Redistributable Package (x64) http://www.microsoft.com/en-us/download/details.aspx?id=13523
Cheers, Antonio Huete