I'm having problems getting Steam to work on my upgraded PC. When I start Steam, it starts the update process but once it hits 99%, it drops down to 26% again and repeats this process a few times before I get the error "Steam is currently unavailable, please try again later".
The Steam support page so far hasn't really helped me fix this problem. I wonder if the problem has something to do with the new AMD64 I've installed? Are there compatibility issues with AMD64 and Steam?
I disabled my Windows firewall and the router I'm using has worked fine with Steam in the past.
Any ideas how I can solve this problem?