These are the recent versions of this date, please check for the latest stable versions at time of install.
First lets install Apache. You should be able to select all of the defaults during the installation process, unless you know what you are specifically trying to accomplish. Be sure to select "Apache Modules" where it talks about the SVN module.
Second lets install SVN, again the defaults work fine.
Third, and last install TortoiseSVN, yup defaults work good for this as well.
Configure Apache Password File:
First lets create a Apache password file, from a command line run:
C:\Program Files\Apache Group\Apache2\bin\htpasswd.exe -c C:\Program Files\Apache Group\Apache2\passwd myuser
Be sure to replace "myuser" with the username you wish to use for your login.
Create a Repository:
Next we need to create a subversion repository:
C:\Program Files\Subversion\bin\svnadmin.exe create C:\MyRepos
In Notepad open up the file "C:\Program Files\Apache Group\Apache2\conf\httpd.conf" and put the following at the end of the file:
Presto! All you need to do is restart Apache via the neat little system tray icon, and import your repository and you are up and rolling.