Hi guys. I saw this topic few weeks ago as i had exactly the same problem. And today I found a solution on some Spanish website, so I've quickly registered to share it with you (translation by Google, but everything's clear): "Well, the solution is simple: create a registry key. For those who do not know, go to C: \ Windows and Execute the regedit. Watch out what you do there, eh? :D Go to HKEY_LOCAL_MACHINE \ SOFTWARE \ Microsoft \ Windows \ CurrentVersion and there cread a new REG_SZ value named ProductID and value 1. Bingo! now you can install or use. I tried to remove once installed and stops working. I tried not to put the 1 and tan. (The truth is that I put to test 1, and strain ...) I know that x64 W7 also give this symptom, and as I have not tested the solution, if you see that does not work Try to create the value in HKEY_LOCAL_MACHINE \ SOFTWARE \ Wow6432Node \ Microsoft \ Windows \ CurrentVersion." Actually I've created those values in both localizations. Works perfectly for me on W7 x64. Enjoy!