I doubt this has anything to do with SF. He should uninstall SH3, then manually delete the SH3 folder (c:\program files\ubisoft\silent hunter iii) and also "my documents\sh3". Then reinstall SH3, install patch 1.4 (he doesn´t need the other patches), then GWX, then the December 23rd update.
If SH3 then still doesn´t work install the SF driver update:
http://www.star-force.com/support/sfdrvup.zip