I know you already have threads on this subject at least from a few years ago, but I just recently discovered an issue with my desktop PC. For some reason, upon startup, I get this message: "The ordinal 459 could not be located in the dynamic link library urlmon.dll" when Google Talk loads. I have to close out of the window repeatedly at least 5 or 6 times. And when all is said and done, I can't even use Google Talk. Sure, I can see my contacts, but clicking on a name results in the message and a blank box. The same is true from Yahoo Messenger, except the message does not show up when clicking on someone's name, but nothing happens so I cannot chat using Yahoo either. Skype is a peculiar one. Not sure if it is related to this problem, but when I click on the Home icon, Skype tells me that I am not online. (I can send and receive chats no problem) I've already tried replacing the DLLs...not sure if I had the correct files or what but I almost prevented my computer from starting up. I also tried reinstalling Google Talk with no success. Please help me fix this!