It didn't help. I've tried all of that including reinstalling pip manually twice, yet the problem persists. The only thing I'm anxious about is the Path variable. Mine is spelt "Path" instead of "PATH". I want to know whether this is the cause of the problem. When i try to change it without applying it, all the other paths in the "Path" variable disappears. Same happens when i try to create a new "PATH" variable. Is there anything else I can do?