How to allow more ram to minecraft on 32 but windows?

I want to allocate more ram to minecraft on 32 bit windows. I have 32 bit Java, which only allows 1gb of ram for every application. I can't upgrade to 64 bit windows, because I don't have the money to buy it. If I try to allow more ram from the minecraft launcher, Java says a fatal error has occurred. Please tell me a solution to this problem.

Added (1). I have plenty of ram, 12gb. Ram isn't the issue.

You can't… Thats the limits of 32bit java and your 32bit machine…

You can't. First of all like Demonslayer said, the RAM limit is around 3-4GB on 32-bit systems (OS and applications included). Sometimes even PAE (physical address extension) won't help as some applications won't know what to do with it as it may not be PAE-aware.