Hi Michael,
Depending on your scenario you might only need to install the Server version and not the Client/Standalone version. Or you might need both. Can you describe what you're trying to accomplish? We can provide advice based on your scenario. If you're just trying out the software, the server version and the Getting Started document are a good start.
The eventvwr log tells me the following:
Error connecting to SQL Server: Login failed for user 'NT AUTHORITY\NETWORK SERVICE'. encountered a critical error and needs attention.
Installation might have failed due to an issue in SQL permissions.
If you need to delete the leftover service run the following from a command line prompt:
SC DELETE “Qdabra DBXL Standalone Edition”