Use www.yandex.ru
type: windows assembler
or type:wasm
press ENTER

example:

www.wasm.ru

Why do U need NASM
insted of use MASM
all of them have similar syntax

masm - is traditionall compiller under windows
(don't Use tasm or any...)



so... in documens(I have only NASM 0.98) there is:
1.3.1 Installing NASM under MS-DOS or Windows

Once you've obtained the DOS archive for NASM, `nasmXXX.zip' (where
`XXX' denotes the version number of NASM contained in the archive),
unpack it into its own directory (for example `c:\nasm').

The archive will contain four executable files: the NASM executable
files `nasm.exe' and `nasmw.exe', and the NDISASM executable files
`ndisasm.exe' and `ndisasmw.exe'. In each case, the file whose name
ends in `w' is a Win32 executable, designed to run under Windows 95
or Windows NT Intel, and the other one is a 16-bit DOS executable.

The only file NASM needs to run is its own executable, so copy (at
least) one of `nasm.exe' and `nasmw.exe' to a directory on your
PATH, or alternatively edit `autoexec.bat' to add the `nasm'
directory to your `PATH'. (If you're only installing the Win32
version, you may wish to rename it to `nasm.exe'.)

That's it - NASM is installed. You don't need the `nasm' directory
to be present to run NASM (unless you've added it to your `PATH'),
so you can delete it if you need to save space; however, you may
want to keep the documentation or test programs.

If you've downloaded the DOS source archive, `nasmXXXs.zip', the
`nasm' directory will also contain the full NASM source code, and a
selection of Makefiles you can (hopefully) use to rebuild your copy
of NASM from scratch. The file `Readme' lists the various Makefiles
and which compilers they work with.

Note that the source files `insnsa.c', `insnsd.c', `insnsi.h' and
`insnsn.c' are automatically generated from the master instruction
table `insns.dat' by a Perl script; the file `macros.c' is generated
from `standard.mac' by another Perl script. Although the NASM 0.98
distribution includes these generated files, you will need to
rebuild them (and hence, will need a Perl interpreter) if you change
`insns.dat', `standard.mac' or the documentation. It is possible
future source distributions may not include these files at all.
Ports of Perl for a variety of platforms, including DOS and Windows,
are available from www.cpan.org.