The Set Associations feature is not working right for certain file types

I'm having some issues with the Set Associations feature, located in the Default Programs section of the Control Panel. There are a number of file types/protocals that are set up to be opened with the wrong programs by default. When I go to change the program, the browse option doesn't let me choose the program I want. One of the files that I'm having this problem with is the .docx file. I want to set up to make Microsoft Word the default program, but it keeps recommending Microsoft Word Viewer and won't let me select Microsoft Word from my computer. I know this isn't a major problem and that the files can be opened by Word using other methods. It's just annoying and it bothers me when something doesn't work right on my computer. Also a lot of the files/protocals have unknown application listed under the default program column. I know that can't be right. Do any of you know what is causing this?

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