I\'ve just downloaded and installed SVN Tortoise, but no commands appear on the menu. How is that possible?
Aside from first rebooting...
Are you running 64-bit or 32-bit Windows? Tortoise runs as a shell extension so if your Windows OS is 64-bit and you installed the 32-bit version of Tortoise, you won't see the context menus.
On a side note. If you use a 32-bit tool like Total Commander in a 64-bit OS, and you want context menu extensions in both Explorer and Total Commander, you will actually have to install both the 32-bit and 64-bit version of Tortoise.