First try deleting them by bypassing the Recycle Bin by using SHIFT-DEL(thanks, Michael Murphy) instead of just DEL.
Try using one of the following free products to delete the file/folder. Unlocker at: http://www.softpedia.com/get/System/System-Miscellaneous/Unlocker.shtml or File Assassin http://www.malwarebytes.org/fileassassin.php (with or without Force Delete and you may need Force Delete in this instance: http://www.mydigitallife.info/2008/12/27/force-delete-cannot-delete-locked-or-in-used-files-or-folders-with-fileassassin/). These programs often work when normal Vista delete functions fail to operate properly. You may have already tried Unlocker (I don't know if it's the same as Unlocker Assistant) but if this one if different, give it a try.
Here's an article on this topic (related to a different subject, but essentially the same problem) with a number of suggestions - one of which may work for you: http://www.howtogeek.com/forum/topic/how-to-delete-source-file-names-are-larger-than-is-.
I hope one of these options helps. If not, post back and we'll see if we can find another answer.
Good luck!
Lorien - MCSE/MCSA/Network+/A+ --- If this post helps to resolve your issue, please click the "Mark as Answer" or "Helpful" button at the top of this message. By marking a post as Answered, or Helpful you help others find the answer faster.