You install any stuff into My Documents/Sports Interactive/Football Manager 2008/ and you can create a new folder there to keep them in. You can call them anything you like.
If you mess around putting things in the Program Files area then it can screw your game up. If you are still getting the 'white screen' then you need to go to C

Documents and Settings\<username>\Application Data\Sports Interactive\Football Manager 2008 and delete the cache folder.
And please don't use text speak on the forums. A lot of people aren't English speaking and don't know what it is and can't understand it