Step 1: Remove any remaining Windows Installer packages of the 2007 Microsoft Office system. 1  Open the %windir%\Installer folder. 2  To do this, click Start, click Run, type %windir%\Installer, and then click OK. 3  On the View menu, click Choose Details.tep 3: Remove any remaining 2007 Microsoft Office installation folders. 1  Open the %CommonProgramFiles%\Microsoft Shared folder. 2  To do this, click Start, click Run, type %CommonProgramFiles%\Microsoft Shared, and then click OK.