I upgraded to windows 7 and installed Dragonica. I ran the game and everything was just fine. After like 2 min the game closed without any warning

. I didnt run or used any 3rd party program. I tried to ask for help at the offical THQ Dragonica's technical issues forum but it seems like no one has an answer. I was wondering if there any way to fix it.
I will appreciate your help!
Thanks