Right. if you downloaded "Mac OS X 10.4 Tiger" then you have a windows blinds skin. I am going to recommend you download this skin instead:
http://www.osx-e.com/downloads/themes/tiger2.html
Now. Download that, then extract the files to the following directory on your hardrive:
C:WINDOWSResourcesThemes
You can then proceed to change the theme by right clicking on the desktop, select properties, click appearance and select tiger. Work ok?
Main Menu