Congrats. Might take you a whole 6 months before you find a game that doesn't run great at full detail ;]
Some links that might help you determine problems that might happen after installing Vista:
Software compatibility chart - http://www.iexbeta.com/wiki/index.php/Windows_Vista_RTM_Software_Compatibility_List
Hardware compatibility chart - http://www.iexbeta.com/wiki/index.php/Windows_Vista_RTM_Hardware_Compatibility_List
Windows Vista Upgrade Advisor - http://www.microsoft.com/windowsvista/getready/upgradeadvisor/default.mspx
The upgrade advisor checks your installed hardware and software and seems to actually know a fair bit of what will and won't work.
Some links that might help you determine problems that might happen after installing Vista:
Software compatibility chart - http://www.iexbeta.com/wiki/index.php/Windows_Vista_RTM_Software_Compatibility_List
Hardware compatibility chart - http://www.iexbeta.com/wiki/index.php/Windows_Vista_RTM_Hardware_Compatibility_List
Windows Vista Upgrade Advisor - http://www.microsoft.com/windowsvista/getready/upgradeadvisor/default.mspx
The upgrade advisor checks your installed hardware and software and seems to actually know a fair bit of what will and won't work.