I was just updating my Windows XP Service Pack 2, to SP 3 (using Boot Camp on Snow Leopard) and I en-counted a problem. Whenever I was half way through updating, a warning message would pop up saying 'An error occurred while copying osloader.ntd. Cannot copy file to destination directory', and the update would fail. After some searching online, many other people are having the same problem so thought I'd post the easy self-fix solution on www.apple.com which I found which guide's you step by step on how to fix the problem and download the update correctly. http://support.apple.com/kb/HT3841 Hope this helps anyone that was as stuck as I was.