All of the configuration data and that includes add-ons can be found in blender's appdata folder now M$ in it's infinite wisdom made all these folders hidden so if you do not know they exist you can not find them because they are just not shown in explorer windows till you toggle show hidden files/folders lots of issues on Widows are caused by M$ policy.BTW you can find all this as part of the blender documentation web site.
Enjoy the Choice