Why need compiling?

[wsxdrfv]

I want to make alt-coin.

I want to do this without install ubuntu. Can I? Is this possible?


And why compiling process need? Compiling bitcoin source is really hard in windows 10, right?

And there is already compile done -qt.exe file at googling.

But if I change parameters at source code, then I need to recompile and make another version's -qt.exe file?