Here is what you do to retrieve source code from an SVN repository:
1. Download TortoiseSVN, it integrates into the explorer shell in Windows. http://tortoisesvn.net/downloads
2. Create a folder somewhere you want to store the source code.
3. Open the folder and right click somewhere and then click SVN checkout.

4. A windows comes up and you enter the URL. You'll need the SVN url and enter it in:

5. After you click ok, it downloads everything. The end.