Next to each update there is a KB or Knowledge Base number. Just type that into Bing or Microsoft.com's search field to get the appropriate update. Download it, install it manually.
Search Microsoft.com Advanced Search Bing
Any one of those 3 with the KB & # will get you everything you need. You have to remember, Win7 was just released 2 days ago and there is massive strain on their servers. So some updates may not work right now with the amount of people trying to get them all at this point in time.
Can also try just going through Bing with Office Update Error 646. Doing so got me:
Error code 646
Among so many more.