there are a number of threads on this mate... (use the search function)
but, you need to make a skins folder in mydocs/sportsinteractice/fm/*SKINS* and just urar the skin directly into that folder and load it up in the preference menu
Download Skin> Extract to[With Win RAR which can be found here ], Skin folder in the FM 2010 folder> Go in game> Preferences> Display & Sound > Select Skin> Untick Use Sin Cache > Tick Always reload skin on confirm.
You must get your type of computer 32/64 Bit.which can be found by Start > Control Panel > System and security/maintanance > System. Look down and youll see what type of processor you have.