Windows .exe cant update launcher

[Ashzification]

yeah.

As a note: when you can't give more memory to your launcher, it's usually due to the wrong Java
A complete reinstall of all MC related programs usually does the trick!
Glad you got it going!

 

[Punny Bunny]

My suggestion would be to check your "Programs and Features" in your Control Panel to triple check which versions of Java you have installed. It's incredibly easy to accidentally install 32-bit Java (unfortunately), and it immediately takes precedent over 64-bit. =(