Hi again coolbyte,
The next thing that comes to mind is to try XP Mode (Virtual PC). You have Windows 7 Professional so you are eligible to download and run it. Here's the download page
. It's basically an emulation/virtualization of Windows XP, different from XP Compatibility... And with 3 GB of RAM you should be okay performance-wise. I know it's a bit of a hassle, but it seems like this game is really important to you so I encourage you to try XP Mode. Let me know how it goes.
Windows Outreach Team