Assembly language, i Hope you are asking about Assembly language
You can find a lot of tutorials for ASM. One Famous Book is Peter Abels's IBM PC Assembly Language And Programming.
Here is one site help regarding the same.
The above are mostly reference to X86 (16-bit) real-mode assembly tutorials. You won't be able to use those in windows. Here's a tutorial on protected 32-bit mode: http://siyobik.info/index.php?document=x86_32bit_asm