Penumbra Overture crashes when I leave the boat

[Weave]

Hey try this:

1. Write permission fail

This crash would happen during loading of new map. Make sure Penumbra
has full disk read/write permission in the directory it is installed.
Normally, Penumbra should not require this, but there might be occasions
when cache files become out of date and the game tries to update them.
For Windows Vista users, also try running as Administrator.

I'm technologically inept, can you tell me how?