I was using Windows Vista and have recently switched to Windows 7. The problem is that Pro Evolution Soccer is running slow in this operating system. The game is the latest version, that is PES 2010. It was running fine a couple of days ago when I had firstly installed it. But then, now it is running very slow. I also play other games and they are working fine. The problem is with PES. Please help me with suitable solutions to this problem.