How to delete a hardlink?

Note: I am no good in superuser or system administration. So I don't even know whether the statement of Title is correct or not.

So, I had to use python2 for a particular project but my Windows system wasn't recognizing python2 even though I installed it and put the correct environment variables.

So, after a bit of google search, I followed this website https://samsclass.info/124/proj14/python2.7-win.htm and executed this

mklink /H python.exe c:\python27\python.exe

After I was done with my work, I uninstalled python2 and installed python3.
But when I execute python --version in cmd a popup opens and it shows
python.exe - System Error. The code execution cannot proceed because python27.dll was not found

Please help me fix this. I have been searching internet for whole day and couldn't find anything

Go into the folder where you put that python.exe, select the file and then delete it.

If you don't know where that is then from a command prompt run where python.exe and then del whatever pops up first.