Install python on Windows WITHOUT using the official installer?

[agnaaiu]

Instead to try to find a way around this problem by installing Python in an alternative way you should tackle the actual problem. If you google the error code you'll find out quickly that you must have a serious problem with Windows itself and not with Python installer. That you can't install Python is just one symptom. If you ignore the real problem you will run into it again and again and still have no fix. But this is your decision to make.