That's a dotnet guid.
It looks like windows installer thinks your dotnet is broken in some way. The NAS itself doesn't need dotnet so you could just copy the files onto your system and use the finsql.exe command line to register the service.
Recent versions of windows don't let you reinstall dotnet (because it's an essential part of the system; yea right) so it you can't find a specific fix I'd suggest hammering the problem by installing say version 3.5 of dotnet. It's huge installer includes copies of every supported version of dotnet.
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It looks like windows installer thinks your dotnet is broken in some way. The NAS itself doesn't need dotnet so you could just copy the files onto your system and use the finsql.exe command line to register the service.
Recent versions of windows don't let you reinstall dotnet (because it's an essential part of the system; yea right) so it you can't find a specific fix I'd suggest hammering the problem by installing say version 3.5 of dotnet. It's huge installer includes copies of every supported version of dotnet.
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