I'm really sorry that you have come to such issue. Unfortunatly we are unable to reproduce it in our environment, which is similar to yours - the only difference is that we are running windows Server 2008 enterprise R2. These server OSs are very specific in terms of rights and permissions.
I assume you did the following:
1. Installeed Test Studio
2. Opened Samples project
3. Clicked on DataDrivenTestBuiltInGrid
4. In License dialog selected Trial and test was properly open
5. You closed the solution/visual studio and when opened it again and loaded the same solution - did you get the license dialog again? in which to only select Trial without entering credentials?
Can you also tell me if you go to folder "C:\ProgramData\Telerik\" if you see a file Hash.lic and a folder TESTSTUDIO, containing 3 files?
Also are you using an account that has full administrative rights on this machine?
Any additional information on the problem will be helpful in order to process your problem asap.
the Telerik team
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