Error: Registry key 'Software\JavaSoft\Java Runtime Environment'\CurrentVersion'? [duplicate]

On my Windows 7 machine, it was solved by doing the following:

1. In the START menu type "regedit" to open the Registry (be careful doing this)
2. Go to "HKEY_LOCAL_MACHINE" on the left-hand side registry explorer/tree menu
3. Click "SOFTWARE" within the "HKEY_LOCAL_MACHINE" registries
4. Click "JavaSoft" within the "SOFTWARE" registries
5. Click "Java Runtime Environment" within the "JavaSoft" list of registries
6. Highlight "CurrentVersion" (should see it in the main registry key explorer window on the right)
7. Change version to "1.7"

That is all... should work. Short of that, if you've already tried some other guides and/or messed up your registries, the most certain way to deal with the problem is to delete all previous versions of Java (using "Programs and Features" uninstall process) and then re-install just the version you want to work with. I'd suggest the distribution site at:http://java.com (as it usually has the most stable version)

Or look for a specific version you need from Oracle's site:http://www.oracle.com/technetwork/java/javase/downloads/

I had various JDK from 1.5 to 1.7 installed on my PC. I had a need to learn JDK1.8 so installed and my earlier versions of Eclipse (depended on earlier versions of JDK) and I got errors launching my Eclipse IDE, on the command line I tried to check the Java Version and got the error below,

C:\>java -versionRegistry key 'Software\JavaSoft\Java Runtime Environment\CurrentVersion'has value '1.8', but '1.6' is required.Error: could not find java.dllError: could not find Java SE Runtime Environment.

Solution:-I removed

C:\ProgramData\Oracle\Java\javapath;

Go to 'c:/Windows/System32' and delete the java.exe, javaw.exe and javaws.exe there.See at Registry Key '...' has value '1.7', but '1.6' is required. Java 1.7 is Installed and the Registry is Pointing to it