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Thanks for your support.
But id try to did all of the steps, explained in the thread but still couldnt figure it out?
First i downloaded 32 bit with JDK, it doesnt work
then i downloaded 64 bit without JDK and installed windows*64 bit JDK and run that , but still no
i installed java ddl, i tried to open it via different components like explorer, etc but ...
How to launch SQL Developer....any other way with full explanation, i am new in this field though.
You don't provide any specifics about your OS and so on, but using a SQL Developer 32-bit download which includes jdk1.6.0_11 is the very simplest case. It should work on either a 32-bit or 64 version of Windows.
I have never personally experienced the missing MSVCR71.dll error, but I did experience a missing MSVCR100.dll error when trying out jdk1.7.0 on WinXP 32-bit. The solution was to place a copy of MSVCR100.dll from jdk1.7.0 into the <sqldev_install>\sqldeveloper\sqldeveloper\bin directory where sqldeveloper.conf also resides.
In your environment, for whatever reason (whether 64-bit WinXP, Vista, or Win7), the SQL Developer with jre install is complaining about a missing MSVCR71.dll. So I assume a symmetrical solution should work for you: place a copy of MSVCR71.dll into the same directory as sqldeveloper.conf. You should be able to find a copy of it in <sqldev_install>\sqldeveloper\jdk\jre\bin.
Another poster followed this advice and it worked:
SQL Developer won't start
Also, you may want to check your sqldeveloper.conf file to make sure it contains a line like the following: