Weird... Are you on the administrator account of your computer? Or can you somehow allow folder/file exceptions your anti-virus ?
EDIT: I found out you can, here's the
link to the site that tells you how to do it.. Hope this helps ^^; Oh here's another one..
Click here.. You might want to restart the computer if this doesn't work.
But no, I guess they're moving hosts or something, therefore it redirects here so that people can check for updates.