Thing to try to get the game running on vista.
Here is a list of thing that have worked for people to get the game running under Vista. If you have more to add, do so, i will put them in the first post. Control Panel -> User Accounts ->Turn User Account Control On or Off.Untick the box which say: 'Use User Account Control (UAC) to help protect your computer'.rebootFrom the Windows command line: BCDEDIT /set IncreaseUserVa 2800Then you must reboot your computer.Start -> Control Panel -> System -> Device Manager -> disk drives -> double click on your(s) hard drive ->policies -> Remove check for Enable Write Caching on the disk.right click on your shortcut, go to properties, compatibility, put a check to disable visual theme and Disable desktop compositionDo the same thing for Witcher.exe found in c:\program files\the witcher\system\Start the game from the file Witcher.exe found in c:\program files\the witcher\system\If you get an error message with Side by Side in it:Uninstall Visual C++ redistributable from the add/remove program panelDownload and install .Net Framework 1.1 and 1.1sp from MicrosoftRun Vista UpdateDownload and install Visual C++ redistributable again from microsoft (Note: Vista 64 will have to download the X86 and X64 version, install both despite the warnings)If you have a message saying that d3ddx9_35.dll is missing, look for the file on google ad save it to your c:\windows\system32\ Folder. To be able to do so, you will need to have the UAC turned off or Vista will prevent you from doing it.Edit 1: To include silenthunter suggestions
Here is a list of thing that have worked for people to get the game running under Vista. If you have more to add, do so, i will put them in the first post. Control Panel -> User Accounts ->Turn User Account Control On or Off.Untick the box which say: 'Use User Account Control (UAC) to help protect your computer'.rebootFrom the Windows command line: BCDEDIT /set IncreaseUserVa 2800Then you must reboot your computer.Start -> Control Panel -> System -> Device Manager -> disk drives -> double click on your(s) hard drive ->policies -> Remove check for Enable Write Caching on the disk.right click on your shortcut, go to properties, compatibility, put a check to disable visual theme and Disable desktop compositionDo the same thing for Witcher.exe found in c:\program files\the witcher\system\Start the game from the file Witcher.exe found in c:\program files\the witcher\system\If you get an error message with Side by Side in it:Uninstall Visual C++ redistributable from the add/remove program panelDownload and install .Net Framework 1.1 and 1.1sp from MicrosoftRun Vista UpdateDownload and install Visual C++ redistributable again from microsoft (Note: Vista 64 will have to download the X86 and X64 version, install both despite the warnings)If you have a message saying that d3ddx9_35.dll is missing, look for the file on google ad save it to your c:\windows\system32\ Folder. To be able to do so, you will need to have the UAC turned off or Vista will prevent you from doing it.Edit 1: To include silenthunter suggestions