How do you change the way your computer opens pdf files?

I accidentally put it on word, and all it does is comes up with a code, so I neeed to know how to change it back.How do you change the way your computer opens pdf files?
Right click on the file....

Select Open With....

Chose your adobe product and check the always use boxHow do you change the way your computer opens pdf files?
copy a file you know that is in .pdf format to your desktop, right click on the file and select open with, then select choose program, select adobe, there is also a check mark that says ';always use the selected program to open this kind of fie'; select that and your good
Right click on one of your PDF files, and then select Open with to choose your PDF reader programme. Don't forget to Hook on 楢lways use the selectedprogram to open this kind of file' finally.

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