I tried downloading the updates from the Intel website and it would not go through. I used to be able to open up docx documents and xlxs documents but now I cannot. Anything I try to do I keep getting the "Windows installer service cannot be accessed". Also get the message Driver is missing.
I recommend you to identify the model and manufacturer name of the motherboard you are using and check the Device Manager to see if there is any device in conflict that is requesting a driver to see why you get that "missing driver message"
Concerning the windows installer issue and the problem to open other documents I recommend you to check directly with Microsoft* since that would be a software / operating system issue