Could this be a widescreen problem?
Have you tried setting your desktop to 1024x768 resolution before starting the game?
There used to be a patch at the developers' old website at http://www.weekendcapri.com/uk/main.htm
However this site no longer works and the web archive is down so I can't check if the patch exists there.
Greyfuss, the instructions said
Update Program for I Misteri di Capri
includes updated English text in few photos of A Quiet Weekend in Capri
Execute InstallUpdate.msi to install Game Updater
Once installed, run Game Updater
Select to update A Quiet Weekend in Capri
So I thought it might work, since I couldn't get to the web archive to check there.