We check this website, now valvesoftware.com is up and dont blocked for our system and other users of the Internet.
So, answer to question: Is valvesoftware Down Right Now? - NO! valvesoftware is up!
If you have problem with access to site valvesoftware, and domain valvesoftware.com is not avalible.
Clear browser cache and/or try other web browser
(Chrome, Firefox or Safari).