anyways.... when u install wow and bc they stick an extra 4 gigabites on your computer that you dont need anymore scince the update in 01/01/07... this is vert important so read the whole thing!!! dont skip!!!
under program files you find 4 folders for wow, unless your computer has already deleted 2 and you only see 2 folders for wow then you dont need to read this... anyways 2 of those 4 folders say wow en_us installer and bc en_us installer ( or sumthing like that )... those are the installer folders for wow and bc and you only needed them when first installing but wow doesnt delete them off your comp so u can delete those 2 folders, nothing will happen to your game play youll just free up 4 gigabites from your computer which can allow quicker downloads more downloads less lag and quicker page refreshing and quicker comp overall when you free up gigabites... my hardrive was full and i couldnt download the new patch so im glad i found out how to free up THAT much space!
thankyou