Dual Installtion of Microsoft Office in one OS If you are installing 2 version of of MS Office 2003 and MS Office 2007, I'm sure u encounter the install dialog when you wanted to open MS Word / Excel 2007 after you closed MS Word / Excel 2003. Quite frustrating right? For waiting for a few minutes. Here the solutions after i search the internet. Just go to the run box (or hit the windows key+r) the type (you may copy and paste) reg add HKCU\Software\Microsoft\Office\11.0\Word\Options /v NoReReg /t REG_DWORD /d 1 reg add HKCU\Software\Microsoft\Office\11.0\Access\Options /v NoReReg /t REG_DWORD /d 1