When you first try to launch SQL developer on your PC you
might run into “Msvcr100.dll is missing” error message. When
you encounter above error massage, you will not be able to launch SQL
developer. However; there is a very simple
step to fix this issue.
First thing you need to do is find MSvcr100.dll on your
machine. Normally it is available on “\Program
Files\Java\jsdk1.7.0_04\bin” folder. Simply copy it and paste it to “\sqldeveloper\sqldeveloper\bin”
folder. This should fix the issue.