My Vista Home Basic SP2 machine misses the relevant Registry values, described under Page 171 of the tutorial (latest and relevent edition)
The registry keys which hold the information on which context menus to show are
HKEY_CURRENT_USER\Software\TortoiseSVN\ContextMenuEntriesMaskLow
andHKEY_CURRENT_USER\Software\TortoiseSVN\ContextMenuEntriesMaskHigh
.