Use the line with Office\11.0 if you have Office 2003 installed and Office\12.0 if you have Office 2007 installed. You can use both if you have both installed :
reg add HKCU\Software\Microsoft\Office\11.0\Word\Options /v NoReReg /t REG_DWORD /d 1
reg add HKCU\Software\Microsoft\Office\12.0\Word\Options /v NoReReg /t REG_DWORD /d 1
That is it. Office 2007 might want to have one more spin round the block with it’s configuration dialog box, but that should be it.
Although this will stop the installation issue while word is starting, it does not fix the underlying problem. The day will come when you will need to fix the problem.