So I tried to install the new beta 9-15-10 for ie9 on a vista bottle.
And then on a standard ie7 bottle that I changed to vista.
The installer would not even start.
Here is the log (for the ie7 bottle):
fixme:exec:SHELL_execute flags ignored: 0x00000100
err:module:import_dll Library ktmw32.dll (which is needed by L"Z:\\media\\9AB251DDB251BF07\\Documents and Settings\\David\\Downloads\\IE9-WindowsVista-x86-enu.exe") not found
err:module:import_dll Library RstrtMgr.DLL (which is needed by L"Z:\\media\\9AB251DDB251BF07\\Documents and Settings\\David\\Downloads\\IE9-WindowsVista-x86-enu.exe") not found
err:module:LdrInitializeThunk Main exe initialization for L"Z:\\media\\9AB251DDB251BF07\\Documents and Settings\\David\\Downloads\\IE9-WindowsVista-x86-enu.exe" failed, status c0000135