opening c drive by right cliking and then open only

I have a question that I just can not fix a problem that started a wile back.

When I used to go to look into my c drive or any drive, I used to go to my computer then to c drive and then use a left double click to open the c drive.

Now when I double click the left on the mouse to open my c drive or basically any drive, it takes me to my search results section. I now have to double click the right side of the mouse to open a options box and then click open to open my c drive or any drive.

How did that change and how do I fix it back so all I have to do is left normal double click and open the c drive or any drive. I don't know how it changed

HELP HELP

 

It's a well known problem with an easy fix. Actually various easy fixes.

Do this one:

Go to Start > Run . and type regsvr32 /i shell32.dll
ps. Be sure to include the space before and after the /i

Press enter or click OK. The effect is immediate with no reboot required.