The Skydrive client hangs at signin. The computer was built a year ago and Skydrive operated perfectly fine from the first day. This morning Skydrive came up offline and says "Skydrive - not signed in".

Computer - Desktop configuration, Windows 7 x64 with all updates running on Core i7-3770K, 16GB RAM, 2TB HDD

Steps taken so far:
Reboot computer - multiple times
Reboot Internet router, speed is 20/5
Exit and sign in Skydrive client
Uninstall and reinstall Skydrive client
Reset DNS to OpenDNS
Checked that IE is set to medium-high security

Everything but the Skydrive client is running nicely. I checked my laptop, which also runs Skydrive client to stay in sync with the desktop files, and the laptop is connecting without difficulty to the same files on Skydrive. The laptop is also Windows 7, but x86, 3MB RAM.

Thank you for your assistance.