Purchased DC, received email with zip file and serial #, installed on Computer 1, seemed to install, but won't start. Help window appears, but running the program produces .... nothing. Same experience on Computer 2. Then installed on Computer 3 and all is well. First start of DC asks for serial #, I entered it, DC came up fine. All three computers are WinXP, and I believe all three have .NET version 2 installed. But if that's the problem - how do I check to make sure .NET Version 2 is installed. Are there other software requirements? Help to get this working on Computers 1/2 appreciated.