I've installed this on 3 comps , Win 7 and Win 8 with no errors, including one that had it previously. Everything worked flawlessly, no errors.
If you are installing on a system that had it previously, make sure you run task manager and verify that it isn't already running.
Check your neos-data folder and remove neos.lock if it's there, and launch the wallet again.
If Neos isn't properly shut down (e.g.: a system reboot or killed through task manager) it won't remove the garbage lock file which indicates to Neos.exe whether or not it's already running. This would explain why there is a unique case so far, as this can only occur during an improper termination or reboot. I'll work on coding a hack for this as I had coded this lockfile in to prevent people from running multiple controller processes which could lead to issues. I'll post an update.
Best regards,
syntaks
Where is this "garbage" file located and what is it called? If a program is properly registered with Windows the shutdown process will request proper termination of the program. If NEOS was properly called to shut down during a reboot process, it should properly shut it self down and not leave a file hanging.