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Level 2

I would suggest few things :

1. First, stop the running ES2 applications in server  and run the uninstaller that comes with ES2.

2. Second, remove all temporary directories that are created as part of previous install. This is IMPO. Some of the directories like  livecycle_temp

    cache data from previous install and corrupt even the new install later.

3. Look at logs more closely and troubleshoot errors there