Upgrading from teamcity 10.0.3 to 2018 (java path issue)

I tried to upgrade teamcity to the latest version from 10.0.3. After uninstalling the previous version and the new one, I picked teamcity and build agent to run under a service account. When I first launched teamcity in localhost, the application was not available. The server logs suggested Java path was not set properly and it couldn't execute java commands. I had teamcity pointing to the built in JRE folder and also had JAVA_HOME variable set in the environment variables for the user. I tried pointing java_home and jre_home to the teamcity jre folder, the actual java path in C:/program files and everything else but I was not able to see the application in the browser. What M ai missing here? I do not have any logs because I had to restore the server to a snapshot I took before the upgrade. My current teamcity _10.0.3 is working fine without any environment variable set for user or system. The build agent property is pointing to C:/JRE which does not exist. Please give suggestions for my next attempt to upgrade teamcity.