Trying to open up outlook on a new windows profile can sometimes bring up the error message “Installation Error: File not Found Go into Registry Editor (Start, Run, “regedit”). Go to HKEY_LOCAL_MACHINE\Software\Microsoft\Office\11.0\Delivery. There should be only 1 directory under Delivery, which is your DownloadCode (mine was 90000409-6000-11D3-8CFE-0150048383C9). Select that directory [or all if more]. On the right side of the screen, right-click on CDCache. Change the value to 0. and problem solved