Prevent “Service has been marked for deletion” while installing windows services
A reminder, if the above message is encountered when installing a windows service after removing a previous version, then
- 
Close all instances of Event Log viewer 
- 
Close all instances of Services MMC (Microsoft Management Console) for all users on server 
- 
Use task manager to ensure the old service process is not running 
- 
Sign other users out of server if above fails 
Since understanding the above the message no longer haunts me.
Stackoverflow post: How to solve “The specified service has been marked for deletion” error
