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threads may be old, but may still be relevant.
I did a quick search on Google, and it points the issue having to do with the InstallShield.
Found some posts regarding Unreal2, BG2, etc.
since it's related to InstallShield, older threads may still be relevant.
http://consumerdocs.installshield.com/selfservice/viewContent.do?externalId=Q108167&sliceId=1
just scroll to the bottom of that for a possible fix, although I'm not sure how similar the XP and Vista/7 registries are, but this is a "fix" directly from InstallShield.
I can't get the game to even begin installing, so I'm not sure where I would even disable 3d acceleration.
[HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\App Paths\BG2Main.Exe]
@="C:\\Program\ Files\\Black Isle\\BGII\\BGMain.Exe"
"BG25_INSTALL"="true"
"BG25GUID"=""
"BG25Language"=""
"BG25StartMenuPath"=""
"BG25Tag"="Baldur?s Gate(TM)II - Throne of Bhaal"
"BG25UninstallPath"=""
"BG25Version"=dword:00006782
"BG2Location"="C:\\Program\ Files\\Black Isle\\bg2\\"
"BG2StartMenuPath"=""
"BG2UninstallPath"=""
"Install"="C:\\Program\ Files\\Black Isle\\BGII\\"
"Path"="C:\\Program\ Files\\Black Isle\\BGII\\"