Infamous "The installer is unable to instantiate the file C:\Users\oracle\AppData\Local\Temp\{CF7ACE29-F720-4702-8739-0DEB3758625D}\KEY_XE.reg" error, during Oracle XE installation

It happens, when install de XE on Windows 7 64 bit, to receive this error from the title. Don't panic, has nothing to do with user rights or folder permissions. It's just another bug.
When error appears, just avoid to click on it, go to folder C:\Users\oracle\AppData\Local\Temp\{CF7ACE29-F720-4702-8739-0DEB3758625D}\, of course, accordingly with your path, copy  the file OracleMTSRecoveryService.reg to KEY_XE.reg, then return to the installing program, click the error and go further. Nothing will bother you again.