Problem: You install TortoiseSVN and find that the right-click context menus and icon overlays are not available!
Solution: Check if you have installed 32-bit TortoiseSVN on 64-bit Windows 7. If yes, uninstall it and install the 64-bit TortoiseSVN.
TortoiseSVN installs itself as an extension to Windows Explorer. The 64-bit Windows Explorer on a 64-bit Windows 7 installation cannot load or communicate with 32-bit TortoiseSVN to display context menus relative to the selected files and directories.