What URL do you use to start? First time you need to open URL, for example, like this - http://localhost:<port number>/admin

Then, I think it must be - "http://192.168.0.15:<port number>/admin"
First time you must run the site at the same PC, where site was install.
But I think it's better to set "localhost" address in first run.

I´ve deleted the first site creating a new one exactly as you have informed but using port 80.

Now the ERROR is below:

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HTTP Error 404.0 - Not Found
The resource you are looking for has been removed, had its name changed, or is temporarily unavailable. Detailed Error Information

Module IIS Web Core
Notification MapRequestHandler
Handler StaticFile
Error Code 0x80070002

Requested URL http://192.168.0.15:80/admin
Physical Path C:\inetpub\wwwroot\KoobooCMS\admin
Logon Method Anonymous
Logon User Anonymous

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Guys,

Its ready on IIS 7 using Windows 7, but really dont run on IIS from Windows 2008 R2 x64.
Kindly make note and inform when solve it.

Rgds,

I have my own step-by-step instruction (but only on Russian) for my new site ("Kooboo on Russian"). If you want I can send it to you :)