I see the keenness of people to help by providing bandaid solutions, but let's go back a step.
Did you buy your copy recently? Is it a budget release? If so, then it's
already patched to 1.4b, hence the errors you are getting when trying to patch it.
If it's an original v1.0 copy, then don't go deleting files as suggested above (it ALWAYS annoys me when people say "just delete the files and it will be alright") because the errors occur for a REASON. And "bandaids" have a habit of falling off, as you are finding out now.

No, what you need to do is ensure that you have the right v1.4b patch for your medium of the game (DVD or download) and for your locale (EMEA or US) - exactly as CapZap mentioned. From what you've stated, it sounds like you need the DVD EMEA version. Install this over a CLEAN install of SH3. Get this right and you'll be error free.