ADDITIONAL SYSTEM INFORMATION :
Observed on Windows 8.1, Windows 10 and Windows Server 2k12
JRE versions 1.8.0_161 and 1.8.0_171

A DESCRIPTION OF THE PROBLEM :
When upgrading between two specific versions of java, occasionally a file (msvcr100.dll) will be removed from the system instead of upgraded. The two java versions we can reproduce this with consistantly are 1.8.0_161 to 1.8.0_171. Rerunning the JRE installer will usually fix this problem.

This is a bug that has appeared occasionally for years:
https://matthiashoys.wordpress.com/2015/11/14/msvcr100-dll-error-launching-sql-developer-4-1-2-with-jdk-8-on-windows-7/
https://stackoverflow.com/questions/22929702/oracle-sql-developer-msvcr100-dll-is-missing-from-your-computer/35275716
https://stackoverflow.com/questions/19655852/java-msvcr100-dll-missing-error


This is a bug caused by the ProductVersion property on the MSVCR100.dll _decreasing_ between 161 and 171
see: https://msdn.microsoft.com/en-us/library/windows/desktop/aa370859(v=vs.85).aspx
The JRE v1.8.0_161 includes a msvcr100.dll with a ProductVersion of 10.00.40219.325
The JRE v1.8.0_171 includes a msvcr100.dll with a ProductVersion of 10.00.40219.1
because the patch version decreased on this dll between .161 and .171, when the windows JRE/JDK installer is run it will mistakenly remove the "old" .dll, but will not install the new one.

The long term fix to prevent this bug is to _not decrease_ the productVersion property on the msvcr100.dll that gets laid down across JRE/JDK versions.



REGRESSION : Last worked in version 8u171

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
1. Run the JRE v1.8.0_161 installer
2. Run the JRE v1.8.0_171 installer as an upgrade
3. attempt to run a java application through the upgraded JRE
observe an error is thrown on application startup: The program cannot start because MSVCR100.dll is missing from your computer. Try reinstalling the program to fix this problem. (reinstalling usually fixes the problem)

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
After upgrading the java version, all files will be correctly installed, and java
ACTUAL -
missing files after upgrading a JRE version will

CUSTOMER SUBMITTED WORKAROUND :
Rerun the installer

FREQUENCY : often