Here are a few tips on what you can do.
For some reason most of the patches have a hard time getting installed on the computer I play wow on. This is most likely hardware related and not Blizzards fault.
What I do is copy the gamefolder over to my usb harddrive. Then I copy the game on to another computer and install the patches there. Then I just copy the game back to my computer. If you don't have a usb drive like me. There are several options to do.
If you have a friend that plays wow. If so ask if he can burn a copy for you.
If you have several computers here is a link explaining how to share folders on different computers. This is for win2k and xp.
http://www.wellesley.edu/Computing/FileSharing/Windows/win2kxp.html
Hopefully this would get your problems solved.