You will need an implementation of TeX for Windows. A number of implementations are listed on the TeX Users Group website.
AUCTeX is an Emacs package for writing LaTeX files, which also includes preview-latex, an Emacs mode for previewing the formatted contents of LaTeX documents. Pre-compiled versions for Windows are available from the AUCTeX site.
Emacs has support for spell checking on demand (ispell) and as
your type (flyspell). Both packages depend on a copy of
ispell 3.2 or a compatible spell-checking program.
GNU Aspell is a popular choice these days, Windows installers are
available from the official site.
Once installed, you will need to configure ispell-program-name
to tell ispell and flyspell to use aspell as a replacement for
ispell. You can include the full path to the aspell binary, which
means you do not need to add its installation directory to the PATH.
GNU Privacy Guard is a Free replacement for PGP, with Windows binaries available. See http://www.gnupg.org/.
Some wheel mice ship with default settings that do not send the standard wheel events to programs, but instead try to simulate scroll bar events. Usually this is configurable from the hardware specific pages on the mouse control panel. The middle button is often mapped in the same settings to have some functionality other than sending middle mouse button events. In some cases, uninstalling the manufacturer's drivers and telling Windows to use the generic USB or PS/2 drivers is the only way to make the mouse work properly.
The best way to use M-x grep with Emacs is to download a port of GNU grep. See Other useful ports.
If you want a quick solution without installing extra tools, a poor substitute that works for simple text searches is to specify the built in Windows command findstr as the command to run at the M-x grep prompt. Normally you will want to use the /n argument to findstr.
The Emacs commands rgrep, grep-find
and find-grep-dired are all different interfaces for
grepping recursively into subdirectories. By default, they use the
command find to determine which files to work on, and either
run grep directly from find, or use xargs to batch
up files and reduce the number of invocations of grep.
Windows also comes with a find command, but it is not in any
way compatible with the POSIX find that Emacs tries to use.
Emacs expects a find compatible with GNU findutils.
See Other useful ports. After you have installed it, you will need
to make sure that Emacs finds this version, not the standard Windows
find command. You can do this by either renaming the
Windows command, changing your PATH to ensure that the directory
containing the findutils bin directory comes before the Windows
system directory, or set the variable find-program to the full
path to the findutils find command.
An alternative if you have a recent version of grep is to customize
grep-find-command to use ‘grep -r’ instead of both find
and grep. Another alternative if you don't need the full capabilities
of grep is to use ‘findstr /n /r’.