Problem w/ 1.05...

[Castellon]

Two most common causes.
1) You Dled the incorrect version of the patch.
2) It cannot find the path to your game.

Fix:
Insure you have the correct version of 1.05.
Reinstall to the default path, or edit the registry entry with the path you are useing.

 

[Castellon]

start regedit (Start => Run => regedit => Enter) and navigate to "HKEY_LOCAL_MACHINE\Software\Paradox Entertainment"
If you are nervous about editing the Registry then get someone to do it for you.
Or reinstall to default directory.

 

[Castellon]

Who is the publisher of your version?
Their logo should be on the CD.